Do peptides and peppermint oil actually grow hair, or is this TikTok hype?

What did @daphnunez actually say?

The creator showed off what she describes as new hair growth and credited two topical serums: Living Proof and a budget alternative called Kaleidoscope Miracle Drops. She told viewers that "these are expensive" and pushed hard for the dupe angle, saying peppermint and tea tree "stimulate follicles" while Living Proof earns its price because it has peptides. Her bottom line: "get on a good hair serum. Do it. Do it do it do it."

To be fair, she did not claim these products cure a disease or reverse diagnosed alopecia. She framed it around cosmetic thinning and "patches," which keeps her in relatively safe territory. But the confident "you will not regret it" guarantee for a category of products with genuinely mixed evidence deserves a closer look.

Does the science back this up?

Partially, and the details matter a lot here. Peppermint oil has the most credible topical evidence of anything she mentioned. A 2014 study by Oh et al. in Toxicological Research found that a 3% peppermint oil solution outperformed minoxidil in promoting dermal thickness and follicle depth in mice. That is genuinely interesting data, though mouse studies do not translate automatically to humans.

For humans, a small 2021 randomized controlled trial by Jarrahi et al. in Phytotherapy Research showed peppermint-containing topical formulations improved hair density in people with androgenetic alopecia compared to baseline. The effect sizes were modest, not dramatic. Tea tree oil has solid antifungal and anti-inflammatory properties, but direct evidence linking it to follicle stimulation in otherwise healthy scalps is thin. As for peptides like GHK-Cu, which is likely what Living Proof is using given its branding, a 2007 study by Pickart et al. in Journal of Biomaterials Science showed GHK-Cu can upregulate proteins involved in hair follicle cycling. Again, the human clinical data is limited compared to in vitro findings.

What did they get wrong (or right)?

She got the peppermint mechanism directionally right. It does appear to work through increased circulation and possible 5-alpha reductase inhibition, which is the same pathway targeted by some pharmaceutical hair loss treatments. That is not nothing. Credit where it is due.

Where she oversimplifies: calling these products functional "dupes" for each other implies roughly equivalent efficacy. A peptide serum and a peppermint-plus-tea-tree serum work through completely different mechanisms at different biological targets. One is not a substitute for the other. They happen to be in the same product category but they are not doing the same thing.

She also skips over a critical variable: the cause of thinning. Hair loss from nutritional deficiency, thyroid dysfunction, postpartum hormonal shifts, or scarring alopecia will not respond to a topical serum the way diffuse thinning from minor stress or seasonal shedding might. Recommending serums to anyone with "patches" without mentioning that patches can signal conditions requiring medical evaluation is a gap worth flagging.

What should you actually know?

Topical hair serums are not snake oil, but they are also not a guaranteed fix for everyone showing up to TikTok with thinning hair. The honest picture is this: for mild, non-scarring, non-hormonal hair thinning, a well-formulated topical with peppermint oil or a copper peptide like GHK-Cu may support the environment for hair growth. The keyword is "support," not "cause."

If you are seeing actual patches or rapid diffuse shedding, a dermatologist visit is step one, not a serum purchase. Conditions like alopecia areata, tinea capitis, or telogen effluvium triggered by a medical issue need proper diagnosis. No topical product addresses those root causes.

On the peptide side specifically: GHK-Cu is a legitimately researched compound with evidence for wound healing and some hair follicle support. It is not in the same clinical tier as minoxidil or finasteride, the two FDA-approved topical and oral treatments for androgenetic alopecia. If your hair loss is significant and persistent, those proven options should be part of the conversation with a provider.

The bottom line on budget dupes

The "dupe" framing is catchy but slightly misleading. Kaleidoscope Miracle Drops and Living Proof are both real products with real ingredients, but the comparison implies interchangeable performance. Peppermint oil and peptides work differently. You might prefer one over the other based on your specific situation, not just your budget. Anecdotal before-and-after content on TikTok, including the little hairs she points to, cannot establish causation. Hair goes through natural growth cycles. New growth eight to twelve weeks into using a product may or may not be because of the product.