glutathione vs milk thistle for liver 500 mg Plus – 21st Century Vitamins – 21st Century Vitamins Milk Thistle for Liver Health:

[12] Gastric acid-suppressing agents (proton-pump inhibitors and H-receptor antagonists) diminish dietary B12 liberation from protein complexes, a pharmacodynamic interaction that can exacerbate underlying deficiency

This means your bodys ability to break down histamine is reduced from the start

Laboratory Handling and Storage Protocols Lyophilized Powder Storage: Store at -20C to -80C in original sealed vial Protect from light exposure and moisture Desiccated storage environment recommended Stability data available for 24+ months at -20C Blue-green color indicates copper complex integrity Stability Considerations: GHK-Cu demonstrates good stability as a lyophilized powder

& Epstein, R