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GHK-Cu splits by form: topical versions are legally sold as a cosmetic ingredient, while injectable GHK-Cu is unapproved and sold under research labeling only
Always talk to a doctor before starting supplements, even if you think you need more
The FDA raised concerns about limited human trials, inconsistent chemical information, possible immune reactions and difficulty confirming the purity of finished products
A healthy gut also helps balance hormones
Unlike fat-soluble vitamins that require fat for absorption and are stored in the liver, water-soluble vitamins like B12 are processed more quickly by the body and are not stored for long-term use
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