Strengthening your skin’s immunity can make you look younger.
A 2013 UCLA study published in the Journal of Investigative Dermatology found that acne-prone subjects lacked a certain strain of surface bacteria, suggesting that skin needs good bacteria to keep the bad in check. New York gastroentologist Roshini Raj, MD, co-founded the Tula skincare line based on the principle that applying probiotics to skin has been shown to stimulate elasticity and collagen production.
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