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That is the recurring trap of this comparison: the best evidence and the marketed use rarely line up

Exposing to light breaks down the compounds

Glow Glutathione

However, it is still considered effective and generally safe

This creates a risk of: Contamination with undisclosed active substances Inaccurate labelling , meaning the product may contain more or less of a compound than stated Adulteration with pharmaceutical agents, including stimulants or diuretics, which have been identified in some weight loss supplements by the MHRA Even where peptide compounds are genuine, oral bioavailability is a fundamental pharmacological challenge