What did @drmartinkinsella actually say?
The claim is straightforward: three lifestyle changes can increase your testosterone. Those are compound weightlifting, supplementing with vitamin D3 and zinc, and eating high protein while moderating fat and cutting back on alcohol. No specific numbers, no dosages, no dramatic promises. For a testosterone video on TikTok, that's already a relatively measured pitch.
The framing matters here. He says "increase your testosterone," not "optimize," not "double," not "replace TRT." That word choice is actually doing a lot of work. These interventions are most relevant for men whose levels are suppressed by lifestyle factors, not for men with clinical hypogonadism caused by structural or hormonal pathology. That distinction doesn't get made in the video, and that absence is worth examining.
Does the science back this up?
Mostly, yes, with real caveats attached to each claim. The evidence isn't uniform across all three recommendations, and the strength of effect varies considerably depending on your baseline.
On resistance training: the link between heavy compound movements and acute testosterone elevation is well-established. Kraemer and Ratamess (2005, Sports Medicine) documented acute post-exercise testosterone spikes following high-volume, multi-joint resistance protocols. The honest qualifier is that these spikes are transient, and whether chronic training meaningfully raises resting testosterone in healthy men is less clear. In men with low baseline levels, the effect is more pronounced.
On vitamin D3: a randomized controlled trial by Pilz et al. (2011, Hormone and Metabolic Research) found that men supplementing with around 3,300 IU of vitamin D daily for a year had significantly higher testosterone than placebo. However, this effect was largely confined to men who were vitamin D deficient to begin with. If your levels are already sufficient, adding more D3 probably won't move your testosterone needle much.
On zinc: Prasad et al. (1996, Nutrition) showed that zinc restriction in healthy men caused a significant drop in testosterone, and supplementation in zinc-deficient older men restored it. Again, the key word is deficient. Supplementing zinc when you're already replete is unlikely to produce much benefit.
On protein and alcohol: higher protein intake supports muscle protein synthesis and may help maintain hormonal function during caloric restriction. Alcohol suppression of testosterone is well-documented, with chronic heavy drinking reducing Leydig cell function (Emanuele and Emanuele, 1998, Alcohol Health and Research World).
What did they get wrong (or right)?
Credit where it's due: the advice is broadly defensible and avoids the worst excesses of testosterone content online. No one is being told to inject anything, buy a supplement stack, or dismiss a doctor.
What's missing is the baseline problem. "Take some supplements, especially Vitamin D3 and zinc" skips the most clinically relevant question: are you actually deficient? Both nutrients have a ceiling effect on testosterone. Supplementing without knowing your blood levels is shooting in the dark. A viewer with normal zinc and normal vitamin D3 who buys both supplements based on this video is likely wasting money.
The diet advice gets murkier. "Moderating your fat" is vague and potentially counterproductive. Dietary fat, particularly saturated and monounsaturated fat, is a substrate for testosterone biosynthesis. Studies including Hamalainen et al. (1984, Hormone Research) found that low-fat diets were associated with lower testosterone. Telling people to "moderate" fat without context could lead some viewers to over-restrict fat, which would work against testosterone, not for it.
The alcohol point is correct and under-discussed. Chronic alcohol use genuinely impairs testosterone production, and even moderate regular drinking may blunt hormonal function in some men.
What should you actually know?
These interventions are real, but they're not a substitute for diagnosis. If you have symptoms of low testosterone, including fatigue, low libido, poor body composition and mood changes, the starting point is a blood test, not a zinc supplement. Clinical hypogonadism has a specific threshold (generally below 300 ng/dL total testosterone in most guidelines) and lifestyle changes alone won't correct it if the cause is structural.
What lifestyle changes can do is remove suppressive factors. Poor sleep, obesity, alcohol, sedentary behavior and nutritional deficiencies all push testosterone down. Fixing those is legitimate medicine. But the video doesn't clearly separate "removing suppression" from "boosting testosterone above your natural set point," and that gap leaves room for unrealistic expectations.
If you're serious about knowing where your testosterone actually stands, get tested. A telehealth provider can order a total testosterone, free testosterone, LH, FSH and SHBG panel and give you numbers to work with, not just lifestyle hacks.