What is the approximate natural pH range of healthy hair and skin?
a.3.5 to 4.0
b.7.0 to 8.0
c.4.5 to 5.5
d.1.5 to 3.0
Explanation
Healthy hair and skin sit in a slightly acidic range of about 4.5 to 5.5. This is often called the acid mantle and helps protect against bacteria and moisture loss.
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