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Aminexil is the molecule Vichy built the line around, used as a course rather than a one-off. Whether it helps depends entirely on why you're shedding — it won't do much for hormonal or nutritional causes on its own, and sudden or patchy loss needs a dermatologist, not a shampoo.

The dry-hair anti-dandruff version, or Dercos Ultra Soothing if flaking isn't the main issue and the itch is.

Not for most people. It's a serum step — you still need a moisturiser over it, and sunscreen in the morning.

L'Oréal, in the same dermatological division as La Roche-Posay and CeraVe.