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But stability research has shown that in copper peptide formulations exposed to light, sodium benzoate can generate trace peroxides that oxidise the histidine residue in GHK, weakening copper binding

Gazvani R, Bates M, Vince G, Christmas S, Lewis-Jones I, Kingsland C (2001) Concentration of interleukin-12 in the peritoneal fluid is not influenced by the presence of endometriosis, its stage or the phase of the menstrual cycle

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A Japanese study from 2008 reported that individuals with mild cognitive impairment experienced cognitive improvements after 16 weeks of supplementation with Yamabushitake or Lions Mane