HGH on TikTok: separating real data from bro-science hype

What did @extraleonardo actually say?

The creator argues that "anyone over the age of 25 has gone to greatly benefit from the use of HGH" and that 3 IU daily is a "good therapeutic dose" year-round because it replaces the growth hormone output of your younger years. They list benefits including fat loss, sleep, anti-aging, skin, hair, nails, and gym performance. The only safety caveat they offer is to "keep your blood glucose in check" and avoid insulin resistance.

Worth noting upfront: they consistently say "HDH" instead of HGH, and they use "RU" where the standard unit is IU (International Units). These aren't just verbal tics. If someone searches this terminology to verify the claims, they'll come up empty. That matters.

Does the science back this up?

Partially, but the framing is deeply misleading. GH secretion does decline with age, that part is real. But the idea that replacing youthful GH levels universally benefits healthy adults is not what the clinical literature supports.

A 2007 meta-analysis by Liu et al. in the Annals of Internal Medicine reviewed 31 trials of GH supplementation in healthy older adults and found modest body composition changes but no improvement in functional outcomes, strength, or quality of life. Adverse effects including edema, joint pain, and insulin resistance were common. The 2019 Endocrine Society Clinical Practice Guideline explicitly states that GH should not be prescribed to healthy adults for anti-aging or athletic enhancement. The idea that 3 IU is a safe blanket dose for anyone over 25 has no clinical grounding. Optimal GH dosing, when medically indicated, is individualized by IGF-1 levels and monitored closely.

What did they get wrong (or right)?

Let's give credit where it's due. GH levels do decline significantly with age. The approximate production figures they cite, around 1.5-2 IU in youth declining to under 1 IU in older adults, are roughly consistent with published data on mean 24-hour GH secretion, though the numbers vary considerably between individuals and studies.

What they got wrong is substantial. First, "anyone over the age of 25" is a blanket recommendation with no diagnostic basis. GH therapy in adults is FDA-approved only for confirmed adult growth hormone deficiency, short bowel syndrome, or HIV-related wasting. Second, framing 3 IU as a "therapeutic dose" for the general public bypasses the entire concept of medical indication. Third, the only safety warning given is insulin resistance. That undersells the real risk profile: carpal tunnel syndrome, fluid retention, gynecomastia, and long-term concerns about cancer risk (Swerdlow et al., 2002, The Lancet) are not mentioned. Calling this a simple, benign supplement is irresponsible.

What should you actually know?

HGH is a controlled substance in the United States. Prescribing it outside of approved indications is illegal, and obtaining it without a prescription is illegal. Any platform or creator offering HGH guidance without licensed medical oversight is operating outside the law, not just outside best practice.

If you're experiencing symptoms that might relate to GH deficiency, such as fatigue, body composition changes, and poor recovery, those symptoms overlap with a dozen other treatable conditions including low testosterone, thyroid dysfunction, and sleep apnea. The right step is lab work with a licensed provider, not a 3 IU year-round protocol from a TikTok bio link.

The "longer you run it the more the benefits compound" framing is also worth scrutinizing. Chronic supraphysiologic GH exposure is exactly the model studied in acromegaly patients, and the outcomes there, including cardiovascular disease and malignancy risk, are not a selling point.

The bottom line

This video presents an unapproved, legally restricted hormone protocol as if it were basic wellness advice. The physiology is partially correct. The recommendations are not. A claim that "anyone over 25" benefits from year-round exogenous HGH is not supported by clinical evidence and contradicts current endocrinology guidelines. The safety discussion is thin to the point of being misleading.