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