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Research Brief

Caffeine shampoo trials: promising, but product-specific

A double-blind trial in women with androgenetic alopecia reported fewer hairs pulled after six months with a phyto-caffeine shampoo versus control shampoo. This is useful for separating topical cosmetic evidence from oral supplement claims.

Hair ThinningTopical caffeine shampooDouble-blind randomized controlled trial
Source linkedLimits includedCheck label before buyingNot medical advice

What the study looked at

Topic
Hair Thinning
Ingredient
Topical caffeine shampoo
Study type
Double-blind randomized controlled trial
Published
2020

What it may mean

Caffeine shampoo may be worth tracking as a topical product category, but evidence should be read as product-formulation specific.

What it does not prove

The trial does not prove that every caffeine shampoo works, and it does not replace evaluation for thyroid disease, iron deficiency, medication effects, scarring alopecia, or sudden shedding.

What shoppers should check

  • Separate topical shampoo evidence from oral supplement claims.
  • Look for the studied active context rather than caffeine wording alone.
  • Check whether the product has human clinical data or only cosmetic marketing language.

Source

Giornale Italiano di Dermatologia e Venereologia / PubMed (2020)

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