However, while vitamin B12 appears to be generally safe, more is not necessarily better
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In a separate head-to-head comparison, GHK-Cu outperformed both retinol (vitamin A) and vitamin C in improving skin firmness and elasticity, and it did so without the irritation, photosensitivity, or adjustment period associated with retinoid use
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Vitamin C improves skin condition and plays a role in collagen formation, resulting in a softer, more beautiful complexion