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Human clinical data is limited for most peptides
The cysteine in whey protein is largely present as glutamylcystine, which is resistant to digestive degradation and serves as an efficient substrate for glutathione synthesis [22]
Look for Cystine or Cysteine levels higher than 600 mg and glycine concentrations greater than 450 mg
Because injections bypass the digestive system, they enter our bloodstream directly
+ Reported side effects can include injection-site redness or irritation, temporary water retention or tingling, headache, and changes in appetite, depending on the peptide
If your diet isnt providing you with enough vitamin B12 and you choose to supplement, consider opting for a B-complex or multivitamin formulated with methyl- or adenosylcobalamin
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