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While copper peptides are generally well-tolerated, some people may experience mild irritation, especially when first using them
For details, see the When to Take section of the Protein Powders and Drinks Review
Below a certain dose, you won't achieve meaningful biological effects
If supplementation is responsible, your doctor may recommend reducing or stopping non-essential B12 intake, with repeat testing after an appropriate interval (typically 2-3 months, or longer if you've had recent injections or have kidney disease)
Chem Commun (2009) 34:51185120