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Expert Treatment A quick injection is administered into the upper arm or thigh
What to Know Before You Start NAC Like any supplement that works on a cellular level, NAC has real effects, and occasionally, your body might speak up about how its responding
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Topical vs Injectable Tolerability Topical GHK-Cu appears better tolerated than injectable forms, with topical side effects typically limited to mild redness, itching, or irritation at application site and rare copper uglies phenomenon (anecdotal accelerated skin aging appearance due to potential MMP upregulation, not well-studied)
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