Does PRP actually work for hair loss? We fact-checked Dr. Peretz

What did @trichogenics actually say?

Dr. Eric Peretz argues that PRP is overhyped for most hair loss patients, specifically those with androgenic alopecia, placing it as a "tier 3 treatment" behind finasteride, minoxidil, and even red light therapy. He also sets a specific threshold: "you need a minimum of 1.5 million platelets per mill of PRP in order for it to actually do anything." He draws a clear line between patient populations, saying PRP works well for alopecia areata and telogen effluvium but is not a primary fix for pattern baldness. He also recommends CBC machine verification as the only reliable quality check on PRP yield. These are specific, testable claims, and that specificity is actually refreshing on a platform that usually just sells clinic packages dressed up as education.

Does the science back this up?

Partly, and more than you might expect from a TikTok. The evidence for PRP in androgenic alopecia is genuinely mixed. A 2019 systematic review by Gupta and Versteeg in the Journal of Cutaneous Medicine and Surgery found statistically significant hair density improvements from PRP, but flagged serious methodological inconsistency across trials, including wildly varying platelet concentrations and injection protocols. That inconsistency is exactly what Peretz is pointing at.

For alopecia areata, the picture is a little cleaner. A 2017 randomized controlled trial by Trink et al. in the Journal of Dermatological Treatment found PRP outperformed triamcinolone acetonide injections for hair regrowth in alopecia areata, lending credibility to his claim that this subtype responds better. For telogen effluvium, the evidence is thinner but directionally supportive. The core problem is that "PRP" is not one standardized treatment. Platelet concentration, activation method, and injection depth all vary clinic to clinic, which is the honest backbone of his argument.

What did they get wrong, or right?

The 1.5 million platelets per milliliter threshold is where things get complicated. Peretz states it as fact, but this number does not come from a single landmark trial. It appears to originate from position papers and expert consensus, most notably work by Dohan Ehrenfest and colleagues, rather than a placebo-controlled dose-finding study. A 2020 review by Haupt and Delanois in Orthopaedic Journal of Sports Medicine noted that optimal platelet concentration thresholds remain debated even outside dermatology. The 1.5 million figure is a reasonable clinical benchmark, but presenting it as settled science overstates the certainty.

His ranking of treatments, finasteride and minoxidil above PRP for androgenic alopecia, is well-supported. Both have decades of Level 1 evidence behind them. Putting red light therapy above PRP is more debatable; low-level laser therapy has decent but not overwhelming evidence, and some clinicians would reverse that ranking. Still, his general hierarchy is defensible. His suggestion that clinics verify platelet yield via CBC is practical and underused advice.

What should you actually know?

If you have androgenic alopecia, PRP is not your first call. The honest version of the evidence is this: finasteride and minoxidil have the strongest data for stopping and partially reversing pattern hair loss. PRP may offer additive benefit, particularly post-hair transplant or as an adjunct, but it should not replace proven medical therapy. A 2021 meta-analysis by Fukuoka and Suga in Dermatologic Surgery found PRP combined with minoxidil outperformed either treatment alone in androgenic alopecia, which actually argues for combination rather than substitution.

For alopecia areata and telogen effluvium, PRP is a more legitimate option, especially when first-line treatments are not tolerated. Cost is real. PRP sessions typically run $500 to $1,500 each and are not covered by insurance. If a clinic cannot tell you their platelet yield and has not measured it with a cell counter, that is a red flag worth taking seriously. The quality control point Peretz makes is one of the most practically useful things said about PRP in a short-form video.

• Do not let a clinic skip platelet concentration testing and call it "premium PRP."
• PRP is not a substitute for finasteride or minoxidil in androgenic alopecia.
• Patient selection matters more than the procedure itself in determining outcomes.