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From Root to Ritual
The cold rinse, the cold plunge, and what cold actually does for the scalp — separating the science from the wellness mythology
Cold therapy has arrived in mainstream wellness — cold plunges, contrast showers, cold rinse finishes to every wash. The hair claims that follow tend toward the vague: "seals the cuticle," "boosts circulation," "stimulates growth." Some of these are accurate. Some are extrapolated beyond the evidence. Here is what cold actually does at the scalp level, and which part of the cold water ritual is worth keeping.