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A useful decision framework for GHK-Cu vs retinol for anti-aging starts with tolerability and evidence hierarchy, then layers in individual skin context and specific goals
For more on oral versus injectable administration, see our next article, the BPC-157 Administration Guide
Expected Timeline for B12 Deficiency Improvement Understanding the typical timeline for improvement helps patients maintain realistic expectations during treatment
Glutathione Unfortunately, glutathione supplements are fully metabolized in the stomach and gut, making them an ineffective source of plasma glutathione
Topical vitamin D has a very low risk of side effects
You should apply them after cleansing and toning but before you put on any heavier moisturizers
