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The main practical disadvantages are: poor absorption in standard capsule form, the need for consistent daily use over 8-12+ weeks before visible results, relatively higher cost for well-absorbed formats, mild and uncommon side effects like digestive discomfort or headache in some users, and the risk of unrealistic expectations from aggressive marketing claims
2014 Nov 19;19(11):19066-77
Current GHK-Cu regulation mainly focuses on cosmetic applications, including anti-aging and skin care formulations
Side effects of hydroxocobalamin
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