Optimal topical (leave in, not shampoo) caffeine concentration. Contradictions across studies.
    Research/Science 7/23/2023

    At a glance
    In this question or advice post, the primary subjects mentioned are
    💧 caffeine (topical) 0.2%
    💧 caffeine (topical) 0.001%
    💧 caffeine (topical) 0.005%
    💧 Minoxidil (topical) 5%
    the tone is 😐 neutral.

    Other terms

    One study suggests a 0.2% caffeine concentration is nearly as effective as 5% minoxidil for hair loss, while other findings indicate that concentrations between 0.001% and 0.005% are more effective, with 0.001% being the most effective. There is no clear consensus on the optimal caffeine concentration for hair loss treatment.
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