The answer is heat regulation. Milady's phrasing is almost word-for-word identical to the question: "Heat regulation is a function of the skin that protects the body from the environment."
Absorption is a real skin function (skin does absorb some substances applied to it), but it isn't the one the textbook specifically frames as environmental protection — heat regulation, which keeps the body at a stable internal temperature regardless of outside conditions, is.
Why this trips people up: this question was keyed to "absorption" in FadeJunkie's own bank until a July 2026 audit found a near-verbatim textbook sentence pointing at heat regulation instead — one of the cleanest, most direct confirmations found during that audit.
Milady Standard Barbering, 6th ed., Ch. 9, p. 229: "Heat regulation. Heat regulation is a function of the skin that protects the body from the environment."
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More real Skin Science questions with sourced answers: What Is a Defining Characteristic of Aged Skin, Which Massage Manipulation Is Proven to Boost Skin Circulation.
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