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True B12 toxicity symptoms are rare but may include skin reactions, mild gastrointestinal disturbances, and headaches, particularly with injections

The problem is biological, not commercial

Enzymology and Detoxification Pathways : Supports assays for glutathione-linked enzymes involved in antioxidant defense and xenobiotic conjugation

I feel like my skin appears smoother and is very hydrated

If your 100mg vial costs $80-150 (common retail range): At 1mg daily: $0.80-1.50 per dose At 2mg daily: $1.60-3.00 per dose At 3mg daily: $2.40-4.50 per dose At 5mg daily: $4.00-7.50 per dose Compared to clinic-administered GHK-Cu treatments costing $50-200+ per session, self-administered research protocols offer substantial cost advantages