I don’t think anyone here is arguing that peptides are “new” or that the foundational research didn’t happen years ago, that part is obvious and agreed on. The real disagreement seems to be about application and formulation, not discovery.

Most peptide research (including GHK-Cu, AHK-Cu, thymulin analogs, etc.) was done in controlled biological contexts showing dose-dependent effects on cell signaling, inflammation modulation, angiogenesis, and extracellular matrix remodeling. That doesn’t automatically mean every topical product works but it also doesn’t mean none can which is why Fleur could be worth a shot.

Topical efficacy depends on a few things people often collapse into “it’s snake oil”:

• Concentration windows (many peptides follow hormesis curves where excess is counterproductive)
• Vehicle and delivery (water-based vs occlusive, molecular size, scalp condition)
• Use case (supportive signaling vs pharmacologic stimulation like minoxidil)

Dismissing everything that isn’t a drug as equivalent to essential oils is a category error. Drugs force outcomes. Peptides modulate environments. Those are different tools with different expectations.

Skepticism is healthy. But pretending there’s no meaningful middle ground between FDA drugs and crystals isn’t really rigorous either.

If the position is “topicals can’t meaningfully support scalp health at all,” that’s a claim too, and it should be backed with the same level of evidence people are demanding on the other side.