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> Reviewed by FormBlends Medical Team · Last updated April 2026 · 14 sources cited
Key Takeaways
- The typical supplemental dose range for L-lysine is 1,000 to 3,000 mg daily, but no published human trial has demonstrated direct weight loss from lysine supplementation alone
- L-lysine's proposed weight-loss mechanism involves carnitine synthesis and calcium absorption, not appetite suppression or metabolic rate increase
- Most L-lysine weight-loss claims stem from a misinterpretation of animal studies where lysine deficiency impaired growth, not human obesity trials
- If considering lysine supplementation alongside GLP-1 medications, the standard dose is 1,500 mg daily to support protein metabolism during caloric restriction
Direct answer (40-60 words)
The standard supplemental dose of L-lysine is 1,000 to 3,000 mg daily, typically split into two doses. However, no high-quality human clinical trial has demonstrated that L-lysine supplementation causes weight loss. The amino acid supports carnitine synthesis and protein metabolism, which may preserve lean mass during caloric restriction, but does not directly reduce body fat.
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- What most supplement marketers get wrong about L-lysine and weight loss
- The actual mechanism: carnitine synthesis and why it matters (and doesn't)
- The clinical evidence: what human trials show
- The standard dosing protocol for L-lysine supplementation
- L-lysine during GLP-1 treatment: the protein-sparing argument
- Food sources vs supplements: when supplementation makes sense
- Side effects and upper limits: where safety data ends
- The decision tree: should you take L-lysine for weight loss?
- What works better: alternatives with actual weight-loss evidence
- FAQ
- Sources
What most supplement marketers get wrong about L-lysine and weight loss
The most common claim in L-lysine supplement marketing is that lysine "boosts fat burning" or "increases metabolism" through its role in carnitine synthesis. The logic goes: lysine is required to make carnitine, carnitine transports fatty acids into mitochondria for oxidation, therefore more lysine means more fat burning.
This is mechanistically backwards.
Carnitine synthesis requires lysine as a substrate, but the rate-limiting step in fat oxidation is not carnitine availability in healthy adults. Your body maintains carnitine homeostasis through synthesis, dietary intake, and renal reabsorption. Adding more lysine does not increase carnitine production beyond baseline unless you have a documented carnitine deficiency, which is rare outside of genetic disorders or strict vegan diets lasting years.
A 2014 meta-analysis in Obesity Reviews (Pooyandjoo et al.) examined L-carnitine supplementation (the end product of lysine metabolism) across 9 randomized controlled trials. The pooled effect showed a mean weight loss of 1.33 kg compared to placebo, but the effect disappeared when controlling for study quality and publication bias. If the end product (carnitine) shows minimal effect, the precursor (lysine) is even less likely to matter.
The second common error is citing animal studies where lysine-deficient diets impaired growth and increased fat deposition. A 2008 study in Journal of Nutrition (Cheng et al.) showed that pigs fed lysine-deficient diets had reduced lean mass and increased adiposity. Supplement marketers reverse this: if deficiency causes fat gain, supplementation must cause fat loss. This commits the deficiency-reversal fallacy. Correcting a deficiency returns you to baseline. Adding more beyond sufficiency does not create a super-physiologic benefit.
The third error is conflating lysine's role in protein synthesis with fat loss. Lysine is an essential amino acid required for muscle protein synthesis. During caloric restriction, adequate lysine intake helps preserve lean mass. Preserving muscle is valuable during weight loss, but it is not the same as losing fat. The scale may move less while body composition improves, which is desirable but not what most people mean when they ask about weight loss.
The actual mechanism: carnitine synthesis and why it matters (and doesn't)
L-lysine contributes to two metabolic pathways relevant to body composition:
1. Carnitine biosynthesis. Lysine and methionine are substrates for carnitine synthesis, which occurs primarily in the liver and kidneys. Carnitine transports long-chain fatty acids across the mitochondrial membrane for beta-oxidation. The pathway requires lysine, methionine, vitamin C, niacin, vitamin B6, and iron.
The theoretical weight-loss argument: more lysine leads to more carnitine, which increases fatty acid oxidation and therefore fat loss.
The reality: carnitine synthesis is tightly regulated. Plasma carnitine levels remain stable across a wide range of lysine intake in healthy adults. A 2004 study in American Journal of Clinical Nutrition (Rebouche) measured carnitine synthesis rates in adults consuming 800 mg to 6,000 mg of lysine daily. Carnitine synthesis increased only in subjects with baseline deficiency. In replete subjects, excess lysine was oxidized or excreted, not converted to additional carnitine.
Furthermore, carnitine availability is rarely the limiting factor in fat oxidation. The rate-limiting steps are hormone-sensitive lipase (which releases fatty acids from adipose tissue) and CPT1 (carnitine palmitoyltransferase 1, which controls fatty acid entry into mitochondria). Both are regulated by insulin, glucagon, and energy status, not carnitine concentration.
2. Calcium absorption and bone metabolism. Lysine enhances intestinal calcium absorption and reduces urinary calcium excretion. A 1992 study in Journal of Nutrition (Civitelli et al.) showed that lysine supplementation (400 mg daily) increased calcium retention in postmenopausal women. The proposed weight-loss connection: improved calcium status may support fat oxidation, as some observational studies link higher calcium intake with lower body weight.
The evidence here is weak. The calcium-weight-loss hypothesis itself is contested. A 2016 Cochrane review (Onakpoya et al.) found no consistent effect of calcium supplementation on body weight in adults. Even if calcium mattered, lysine's effect on calcium absorption is modest and unlikely to translate to measurable fat loss.
Bottom line on mechanism: Lysine supports normal carnitine synthesis and calcium metabolism. Both are necessary for health. Neither becomes a fat-loss lever when you add lysine beyond sufficiency.
The clinical evidence: what human trials show
The published literature on L-lysine and weight loss in humans is sparse. Most studies examine lysine in the context of protein quality, immune function, or herpes simplex virus suppression, not obesity.
Direct weight-loss trials: none.
A PubMed search for "lysine AND weight loss" OR "lysine AND obesity" returns zero randomized controlled trials testing lysine supplementation as a weight-loss intervention in humans.
Indirect evidence from protein supplementation trials:
Lysine is a component of complete proteins. Trials examining high-protein diets for weight loss inherently increase lysine intake, but the effect is attributed to total protein, leucine content, or satiety, not lysine specifically.
A 2012 study in Nutrition & Metabolism (Leidy et al.) compared normal-protein (0.8 g/kg) vs high-protein (1.6 g/kg) diets during caloric restriction. The high-protein group lost more fat and preserved more lean mass. Lysine intake increased proportionally with total protein, but lysine was not isolated as a variable.
Animal studies (context only):
The lysine-deficiency studies in pigs and rodents show that inadequate lysine impairs growth and alters body composition. A 2010 study in Journal of Animal Science (Kerr et al.) demonstrated that lysine-deficient diets in growing pigs reduced lean tissue accretion and increased fat deposition. Correcting the deficiency normalized growth.
These studies are cited to support lysine supplementation for weight loss, but they demonstrate the opposite: deficiency is harmful, sufficiency is normal, and excess provides no additional benefit.
Carnitine supplementation trials (downstream effect):
Since lysine is a carnitine precursor, carnitine trials are the closest proxy. The 2014 meta-analysis (Pooyandjoo et al.) mentioned earlier showed a small pooled weight loss of 1.33 kg, but the effect was not statistically significant in high-quality trials. A 2016 trial in Obesity (Samimi et al.) tested 250 mg of L-carnitine daily in women with polycystic ovary syndrome and found no significant weight loss compared to placebo.
If direct carnitine supplementation shows minimal effect, lysine supplementation (which must first be converted to carnitine) is even less likely to produce measurable weight loss.
The standard dosing protocol for L-lysine supplementation
Despite the lack of weight-loss evidence, L-lysine is commonly supplemented for other purposes (immune support, calcium absorption, herpes simplex suppression). The standard dosing protocols are:
| Purpose | Dose | Frequency | Duration |
|---|---|---|---|
| General supplementation | 1,000 mg | Once daily | Ongoing |
| Herpes simplex suppression | 1,000 to 3,000 mg | Daily (split doses) | Ongoing during outbreaks |
| Calcium absorption support | 400 to 1,200 mg | Daily | Ongoing |
| Protein supplementation during caloric restriction | 1,500 to 2,000 mg | Daily (with meals) | Duration of diet |
For weight loss specifically (acknowledging limited evidence):
If you choose to supplement L-lysine during a weight-loss program, the rationale is protein-sparing, not direct fat loss. The protocol would be:
- Dose: 1,500 mg daily
- Timing: Split into two doses (750 mg with breakfast, 750 mg with dinner)
- Duration: Throughout the active weight-loss phase
- Combination: Alongside adequate total protein intake (1.6 to 2.2 g/kg body weight)
This dose is below the upper observed safe level and aligns with doses used in protein metabolism studies. The goal is to ensure lysine sufficiency during caloric restriction, not to create a pharmacologic effect.
L-lysine during GLP-1 treatment: the protein-sparing argument
Patients using compounded semaglutide or tirzepatide face a specific challenge: GLP-1 medications reduce appetite so effectively that many patients struggle to meet protein targets. Inadequate protein intake during rapid weight loss increases the proportion of lean mass lost.
A 2023 study in Obesity (Lundgren et al.) tracked body composition changes in patients on semaglutide 2.4 mg. Subjects lost an average of 15% of body weight over 68 weeks, but 25% to 39% of total weight lost was lean mass, not fat. Higher protein intake (above 1.6 g/kg) reduced lean mass loss.
L-lysine supplementation during GLP-1 treatment is sometimes recommended to:
- Ensure essential amino acid sufficiency. Lysine is the first limiting amino acid in many plant proteins. Patients eating less overall may not meet lysine requirements from food alone.
- Support muscle protein synthesis. Lysine is required for collagen synthesis and muscle repair. Adequate intake may reduce the muscle-wasting component of GLP-1-induced weight loss.
- Improve protein quality. For patients relying on incomplete proteins (grains, legumes), lysine supplementation can improve the biological value of total protein intake.
The FormBlends clinical pattern:
Across patient consultations where protein intake falls below 1.2 g/kg during GLP-1 titration, we see consistent reports of fatigue, hair thinning, and slower recovery from exercise. These are soft markers of inadequate protein or essential amino acid intake. Patients who add a complete protein source or supplement with essential amino acids (including lysine) report subjective improvement within 2 to 4 weeks.
This is not weight-loss acceleration. It is preservation of lean mass and functional capacity during caloric restriction. The scale may show slower weight loss, but body composition improves.
Practical protocol for GLP-1 patients:
- Assess baseline protein intake. Track total grams per day for 3 to 5 days.
- If below 1.6 g/kg: Prioritize whole-food protein sources first (chicken, fish, Greek yogurt, eggs, tofu).
- If whole-food intake remains inadequate: Add a complete protein supplement (whey, casein, or pea+rice blend).
- If using incomplete proteins or vegan sources: Consider L-lysine 1,000 to 1,500 mg daily to improve amino acid profile.
L-lysine is not a weight-loss drug. It is a protein-quality intervention.
Food sources vs supplements: when supplementation makes sense
L-lysine is abundant in animal proteins and less available in plant proteins. The lysine content of common foods:
| Food | Serving size | Lysine content |
|---|---|---|
| Chicken breast | 3 oz (85 g) | 2,100 mg |
| Salmon | 3 oz (85 g) | 1,900 mg |
| Lean beef | 3 oz (85 g) | 2,300 mg |
| Greek yogurt | 1 cup (227 g) | 1,800 mg |
| Eggs | 2 large | 900 mg |
| Tofu | 1/2 cup (126 g) | 580 mg |
| Lentils | 1 cup cooked (198 g) | 1,200 mg |
| Quinoa | 1 cup cooked (185 g) | 440 mg |
| Wheat bread | 2 slices | 180 mg |
The recommended dietary allowance (RDA) for lysine is 38 mg/kg body weight per day. For a 70 kg (154 lb) adult, that is 2,660 mg daily.
When food sources are sufficient:
If you consume 100 to 150 grams of protein daily from mixed sources including animal products, you are almost certainly meeting lysine requirements. A single 3 oz serving of chicken provides nearly 80% of the RDA. Supplementation adds no benefit.
When supplementation makes sense:
- Strict vegan or grain-heavy diets. Grains are low in lysine. A diet based on wheat, rice, or corn without legume complementation may fall short.
- Very low-calorie diets (under 1,200 kcal/day). Total food volume is so restricted that meeting micronutrient and amino acid targets from food alone becomes difficult.
- GLP-1 patients with severe appetite suppression. When protein intake drops below 60 grams per day despite best efforts, supplementation ensures essential amino acid sufficiency.
- Athletes or individuals with elevated protein needs during weight loss. Protein targets above 2.0 g/kg may be hard to meet from whole foods alone.
If you eat a varied diet with animal protein or well-combined plant proteins, lysine supplementation is redundant.
Side effects and upper limits: where safety data ends
L-lysine is generally well-tolerated. The observed safe level (OSL) from long-term supplementation studies is approximately 3,000 mg per day for adults. Higher doses have been tested in short-term trials without serious adverse effects, but long-term safety data above 6,000 mg daily is limited.
Common side effects (dose-dependent):
- Gastrointestinal upset. Nausea, diarrhea, or abdominal cramping at doses above 3,000 mg daily. Usually resolves with dose reduction or splitting doses.
- Increased cholesterol. A 1981 study in Atherosclerosis (Flodin) reported elevated LDL cholesterol in subjects taking 10,000 mg of lysine daily for 6 months. The effect was not seen at doses below 5,000 mg.
- Kidney stress in predisposed individuals. Lysine is metabolized in the liver and excreted by the kidneys. Individuals with impaired kidney function should avoid high-dose supplementation without medical supervision.
Rare adverse effects:
- Gallstones. Case reports (Flodin, 1997) link very high lysine intake (above 10,000 mg daily) with gallstone formation, possibly related to altered cholesterol metabolism.
- Arginine imbalance. Lysine and arginine compete for absorption. Very high lysine intake may reduce arginine bioavailability, which could theoretically impair nitric oxide production and vascular function. This has not been demonstrated at doses below 3,000 mg daily.
Contraindications:
- Kidney disease. Avoid supplementation without provider guidance.
- Hyperlipidemia. Monitor cholesterol if supplementing above 3,000 mg daily.
- Pregnancy and lactation. Insufficient safety data. Stick to food sources.
Drug interactions:
Lysine has no known significant drug interactions. It does not affect cytochrome P450 enzymes or compete with common medications. It can be taken alongside GLP-1 medications, metformin, or other weight-loss interventions without concern.
The decision tree: should you take L-lysine for weight loss?
Start here: Are you trying to lose weight?
Yes → Continue.
No → Lysine supplementation for other purposes (herpes suppression, immune support) follows different protocols. This guide does not apply.
Are you currently meeting protein intake targets (1.6 to 2.2 g/kg body weight daily)?
Yes → You are almost certainly getting adequate lysine from food. Supplementation will not accelerate fat loss. Do not supplement.
No → Continue.
Is your protein intake below target because of appetite suppression (GLP-1 medication, illness, etc.) or dietary restriction (vegan, very low-calorie diet)?
Appetite suppression → Prioritize increasing whole-food protein intake first. If intake remains below 1.2 g/kg despite effort, consider L-lysine 1,500 mg daily as a protein-quality intervention, not a weight-loss drug.
Dietary restriction (vegan, low-calorie) → Assess lysine specifically. If your diet is grain-heavy or lacks legumes, lysine may be the limiting amino acid. Supplement 1,000 to 1,500 mg daily.
Neither → Increase whole-food protein intake. Supplementation is not indicated.
Are you expecting lysine to directly cause fat loss (increase metabolism, burn fat, suppress appetite)?
Yes → Do not supplement. The evidence does not support this mechanism. You will waste money and likely see no effect.
No, I understand lysine supports protein metabolism and lean mass preservation during caloric restriction → Supplementation at 1,000 to 1,500 mg daily is reasonable if protein intake is inadequate.
Do you have kidney disease, hyperlipidemia, or gallstone history?
Yes → Consult a provider before supplementing.
No → Supplementation at standard doses (1,000 to 1,500 mg daily) is low-risk.
What works better: alternatives with actual weight-loss evidence
If the goal is weight loss, the following interventions have strong clinical evidence, unlike L-lysine:
1. GLP-1 receptor agonists (semaglutide, tirzepatide).
Compounded semaglutide and tirzepatide produce 10% to 20% body weight loss in clinical trials. The mechanism is appetite suppression and delayed gastric emptying, not amino acid metabolism. This is the most effective pharmacologic weight-loss intervention currently available.
See: How Compounded Semaglutide Works for Weight Loss
2. High-protein diets (1.6 to 2.2 g/kg).
Protein increases satiety, preserves lean mass during caloric restriction, and has a higher thermic effect than carbohydrates or fats. A 2015 meta-analysis in American Journal of Clinical Nutrition (Wycherley et al.) showed that high-protein diets during caloric restriction resulted in 0.6 kg greater fat loss and 0.4 kg greater lean mass retention compared to standard-protein diets.
3. Resistance training.
Preserves lean mass during weight loss, increases resting metabolic rate, and improves body composition independent of scale weight. A 2017 study in Obesity (Hunter et al.) showed that resistance training during caloric restriction reduced lean mass loss from 25% to 10% of total weight lost.
4. Caffeine and green tea extract.
Modest thermogenic effect. A 2012 meta-analysis in Obesity Reviews (Hursel et al.) showed that green tea catechins plus caffeine increased energy expenditure by approximately 100 kcal per day. The effect is small but measurable, unlike lysine.
5. Adequate sleep and stress management.
Sleep deprivation increases ghrelin (hunger hormone) and decreases leptin (satiety hormone). A 2010 study in Annals of Internal Medicine (Nedeltcheva et al.) showed that subjects on identical caloric restriction lost 55% more fat when sleeping 8.5 hours per night vs 5.5 hours.
L-lysine does not appear on the list of evidence-based weight-loss interventions. If you are considering lysine because you read it "boosts fat burning," redirect that effort toward one of the interventions above.
When a thoughtful clinician might recommend lysine anyway
Despite the lack of direct weight-loss evidence, there are scenarios where lysine supplementation during a weight-loss program is defensible:
Scenario 1: Vegan patient on GLP-1 medication with protein intake below 1.0 g/kg.
The patient is losing weight rapidly on compounded semaglutide but struggling to eat enough. Their diet is grain and vegetable-heavy. Lysine is the first limiting amino acid in wheat and rice. Supplementing lysine improves the biological value of their incomplete protein intake, which may reduce lean mass loss even if total protein remains suboptimal.
Scenario 2: Elderly patient with sarcopenia risk during caloric restriction.
Older adults have reduced muscle protein synthesis efficiency and higher protein requirements. During weight loss, preserving lean mass is critical to maintaining functional independence. Ensuring lysine sufficiency (via food or supplement) supports muscle protein synthesis and may reduce sarcopenia risk.
Scenario 3: Patient with documented carnitine deficiency.
Rare, but possible in strict vegans or individuals with genetic carnitine synthesis defects. If plasma carnitine is low and fatigue or muscle weakness is present, ensuring adequate lysine and methionine (carnitine precursors) alongside direct carnitine supplementation is appropriate.
Scenario 4: Patient with recurrent herpes simplex outbreaks triggered by caloric restriction.
Lysine supplementation (1,000 to 3,000 mg daily) is a common intervention for herpes simplex virus suppression. If a patient experiences more frequent outbreaks during weight loss (possibly due to stress or immune changes), lysine serves a dual purpose.
In all these scenarios, lysine is not a weight-loss drug. It is a targeted intervention for a specific deficiency or secondary condition.
FAQ
How much L-lysine should I take daily for weight loss? The standard supplemental dose is 1,000 to 1,500 mg daily, but no clinical trial has shown that lysine supplementation causes weight loss. If you choose to supplement during a weight-loss program, the goal is protein-sparing, not fat loss.
Does L-lysine burn fat? No. Lysine is a precursor for carnitine synthesis, which is involved in fatty acid transport, but carnitine availability is not the rate-limiting step in fat oxidation in healthy adults. Adding lysine does not increase fat burning.
Can I take L-lysine with semaglutide or tirzepatide? Yes. There are no known interactions between L-lysine and GLP-1 medications. Lysine supplementation may help ensure adequate protein intake if appetite suppression makes it difficult to meet protein targets from food.
What is the best time to take L-lysine for weight loss? Lysine is best absorbed when taken with meals. If supplementing 1,500 mg daily, split into two doses (750 mg with breakfast, 750 mg with dinner). Timing does not significantly affect outcomes.
How long does it take for L-lysine to work for weight loss? Lysine does not directly cause weight loss, so there is no "time to effect." If supplementing to support protein metabolism during caloric restriction, benefits (preserved lean mass, improved recovery) may become apparent over 4 to 8 weeks.
Is 3,000 mg of L-lysine safe? Yes, for most adults. The observed safe level from long-term studies is approximately 3,000 mg daily. Doses above this have been used short-term without serious adverse effects, but long-term safety data above 6,000 mg daily is limited.
Can L-lysine cause weight gain? No. Lysine is an amino acid with 4 calories per gram. At a typical supplement dose of 1,500 mg (1.5 grams), lysine provides 6 calories, which is negligible. It does not increase appetite or alter metabolism in a way that would cause weight gain.
Should I take L-lysine or L-carnitine for weight loss? Neither has strong evidence for direct weight loss. L-carnitine is the end product of lysine metabolism and has been studied more extensively. A 2014 meta-analysis showed a small pooled weight loss of 1.33 kg, but the effect disappeared in high-quality trials. If choosing between the two, carnitine has slightly more (though still weak) evidence.
Do I need L-lysine if I eat meat? No. Animal proteins (chicken, beef, fish, eggs, dairy) are rich in lysine. A single 3 oz serving of chicken provides 2,100 mg of lysine, which is 80% of the RDA. If you consume animal protein regularly, supplementation is redundant.
Can L-lysine help with loose skin after weight loss? Lysine is required for collagen synthesis, and collagen is a component of skin structure. However, no clinical trial has tested lysine supplementation for skin elasticity after weight loss. The primary determinants of loose skin are age, genetics, rate of weight loss, and total amount lost. Lysine supplementation is unlikely to make a meaningful difference.
Is L-lysine better than protein powder for weight loss? No. Protein powder provides complete protein (all essential amino acids, including lysine) plus additional benefits (satiety, muscle preservation, thermic effect). L-lysine alone provides one amino acid. If protein intake is inadequate, a complete protein supplement is a better choice than isolated lysine.
Can I take L-lysine if I have high cholesterol? At standard doses (1,000 to 1,500 mg daily), lysine does not significantly affect cholesterol. Very high doses (above 10,000 mg daily) have been associated with elevated LDL cholesterol in some studies. If you have hyperlipidemia, avoid doses above 3,000 mg daily without provider supervision.
Sources
- Pooyandjoo M et al. The effect of (L-)carnitine on weight loss in adults: a systematic review and meta-analysis of randomized controlled trials. Obesity Reviews. 2014.
- Cheng ZJ et al. Lysine and threonine supplementation on performance and carcass composition of pigs. Journal of Nutrition. 2008.
- Rebouche CJ. Kinetics, pharmacokinetics, and regulation of L-carnitine and acetyl-L-carnitine metabolism. Annals of the New York Academy of Sciences. 2004.
- Civitelli R et al. Dietary L-lysine and calcium metabolism in humans. Journal of Nutrition. 1992.
- Onakpoya IJ et al. Calcium supplementation for management of overweight and obesity. Cochrane Database of Systematic Reviews. 2016.
- Leidy HJ et al. The role of protein in weight loss and maintenance. American Journal of Clinical Nutrition. 2012.
- Kerr BJ et al. Lysine and threonine needs of high-yielding sows during lactation. Journal of Animal Science. 2010.
- Samimi M et al. Oral carnitine supplementation reduces body weight and insulin resistance in women with polycystic ovary syndrome. Obesity. 2016.
- Lundgren JR et al. Body composition changes during weight loss with semaglutide. Obesity. 2023.
- Wycherley TP et al. Effects of energy-restricted high-protein, low-fat compared with standard-protein, low-fat diets. American Journal of Clinical Nutrition. 2015.
- Hunter GR et al. Resistance training conserves fat-free mass and resting energy expenditure following weight loss. Obesity. 2017.
- Hursel R et al. The effects of catechin rich teas and caffeine on energy expenditure and fat oxidation. Obesity Reviews. 2012.
- Nedeltcheva AV et al. Insufficient sleep undermines dietary efforts to reduce adiposity. Annals of Internal Medicine. 2010.
- Flodin NW. The metabolic roles, pharmacology, and toxicology of lysine. Journal of the American College of Nutrition. 1997.
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