@harveylonsdale_'s TRT fertility protocol, fact-checked

What did @harveylonsdale_ actually say?

The creator laid out a three-drug protocol for men trying to conceive while on testosterone replacement therapy. The pitch: use HCG to stimulate LH, HMG to stimulate FSH, and something called "Pro Vyron" to "increase free testosterone" and "maintain hormonal imbalances" if HCG or HMG converts to estrogen. That's the framework. Let's pull it apart.

To be fair, the underlying logic, that exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis and shuts down sperm production, and that gonadotropins can partially restore it, is not invented. It's real clinical territory. But the execution here has some meaningful errors worth flagging, including a mislabeled hormone, a mechanistic misstatement about Sertoli cells, and a supplement claim that has almost no clinical backing.

Does the science back this up?

The HCG part is broadly correct. HCG does mimic LH and drives intratesticular testosterone production, which is a prerequisite for spermatogenesis. The HMG part is directionally right but mechanistically garbled. "Pro Vyron" is where things get speculative fast.

On HCG: a 2013 study by Wenker et al. in the Journal of Urology confirmed that HCG co-administration with testosterone maintained intratesticular testosterone levels and preserved sperm parameters in hypogonadal men. That's solid evidence. On HMG, which contains both FSH and LH activity: FSH does act on Sertoli cells, but HMG doesn't "stimulate the testes to produce Sertoli cells." Sertoli cells are already present. FSH activates them to support spermatogenesis. That's a different claim and a meaningfully inaccurate one. Amory et al. (2004, Journal of Clinical Endocrinology and Metabolism) documented FSH's role in Sertoli cell function, not production.

What did they get wrong (or right)?

Let's be direct. The creator got the general strategy right but several details wrong.

• "HGG" vs HCG: The creator says "HGG" throughout. This is likely a pronunciation slip for HCG (human chorionic gonadotropin), but it's worth naming because it creates confusion for viewers trying to research this independently.
• Sertoli cell production: Saying HMG signals the testes to "produce Sertoli cells" is inaccurate. Sertoli cells differentiate during fetal development. FSH activates existing Sertoli cells to support sperm maturation. This isn't a minor distinction in a fertility context.
• "Pro Vyron": This appears to be a branded supplement, likely containing ingredients like ashwagandha, zinc, or similar compounds marketed for testosterone support. The claim that it will "increase free testosterone" and prevent estrogen conversion from gonadotropins is not supported by robust clinical evidence. No peer-reviewed trial on this specific product was identified.
• The estrogen framing: HCG can increase aromatase activity and estrogen levels. That part is real. But framing a supplement as the solution to that, rather than an aromatase inhibitor under medical supervision, is a significant oversimplification.

What should you actually know?

If you're on TRT and want to preserve or restore fertility, this is a real and solvable clinical problem, but it requires more precision than a TikTok can deliver.

The standard approach involves stopping exogenous testosterone or combining it with HCG, sometimes with FSH (via HMG or recombinant FSH), and monitoring sperm parameters over months. Recovery timelines vary significantly. Liu et al. (2006, Journal of Clinical Endocrinology and Metabolism) found that spermatogenesis recovery after testosterone-induced suppression took an average of 3.4 months, but some men took over a year.

The estrogen management piece is legitimate but should be handled by a prescribing clinician, not a supplement. Aromatase inhibitors carry their own risk profile and are not appropriate for self-administration.

Anyone pursuing a gonadotropin-based fertility protocol on TRT needs labs, including FSH, LH, estradiol, and semen analysis, and a reproductive endocrinologist or urologist in the loop. A TikTok protocol without that oversight is not a fertility plan.