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en.wikipedia.org/wiki/Acid_mantle

The acid mantle is a very fine, slightly acidic film on the surface of human skin acting as a barrier to bacteria, viruses and other potential contaminants that might penetrate the skin. It is secreted by sebaceous glands. The pH of the skin is between 4.5 and 6.2, slightly acidic.

www.ncbi.nlm.nih.gov/pubmed/18489300

Int J Cosmet Sci. 2006 Oct;28(5):359-70. doi: 10.1111/j.1467-2494.2006.00344.x. Natural skin surface pH is on average below 5, which is beneficial for its ...

www.womenshealthmag.com/beauty/ph-levels

Feb 6, 2013 ... Out-of-whack PH levels are the one condition to blame for everything ... The fix: Determine your skin's status so you can even things out--and ...

www.health24.com/medical/skin/caring-for-your-skin/what-is-skin-ph-20120721

Jan 19, 2005 ... Your skin is fairly acidic, which helps it ward off the advances of harmful bacteria and fungi. The optimal pH of human skin is 5,5 and you can ...

intothegloss.com/2015/06/ph-balance-of-skin

Stop the guessing game. If some products are causing you to be dry, red, or break out, the pH balance of skin may have something to do with that.

www.skincarerx.com/blog/concerns/balancing-act-ph-balance-skin

Oct 26, 2016 ... On a scale of 1-14, with 1 being the most acidic to 14 being the most alkaline, 7 is considered a neutral reading for your skin's pH. Our skin has ...

swsafety.com/phc.html

Balanced pH is Essential for Skin Health. The human body provides its own barrier of protection against disease, environmental irritants and other harmful ...

www.eraorganics.com/whats-the-secret-to-healthy-skin-balance-your-skins-ph-levels

Jun 20, 2015 ... How to Balance Your Skin's PH for a Great Complexion and Faster Healing. Some claim that getting heathy, beautiful skin is simply a matter of ...

www.mass.gov/eea/docs/dep/water/laws/i-thru-z/phral.doc

A pH value of 11 is recommended as an upper do not use/do not drink value. ... risk of skin and eye irritation and possible exacerbation of skin disorders. ... that “ as the pH of buffered solutions applied to the human eye is decreased from 7.4, ...

www.thefrisky.com/2014-11-10/all-the-science-you-need-to-know-about-your-skins-ph-level

Nov 10, 2014 ... I have been having THE WORST breakout lately. What bothers me isn't so much that it's been all over my face -- although lately it has -- but that ...