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Practical tips Before full application, perform a test on a small area of skin to rule out allergic reaction
Especially for those who cannot absorb all of the B12 they ingest due to an underlying condition like inflammatory bowel disease, says Mary Wirtz, a nutrition consultant for Mom Loves Best
They concluded that while GHK-Cu does demonstrate anti-wrinkle effects in cellular studies, "there is a surprising absence of clinical studies using them." The review identified skin permeation as the central challenge: GHK's high aqueous solubility and low partition coefficient work against transdermal absorption
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