Could the salicylic acid in my Nioxin shampoo reduce minoxidil effectiveness? Minoxidil 2/25/2026
Salicylic acid in Nioxin shampoo may reduce minoxidil effectiveness by inhibiting sulfotransferase activity, potentially causing hair loss. Users suggest stopping salicylic acid use or trying alternative treatments like high-concentration tretinoin or medicated minoxidil/finasteride shampoos.
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