The standard advice is to use vitamin C in the morning and copper peptides in the evening, then alternate copper peptides with retinol on different nights, or use them in the same evening routine with copper peptides applied first
In Vitro 13, 867877 (1999)
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References References Selective and membranepermeable small molecule inhibitors of NNMT Roles of Nicotinamide NMethyltransferase in Obesity and Type 2 Diabetes Nicotinamide Nmethyltransferase inhibition mimics and boosts exercisemediated improvements in muscle function in aged mice Reduced calorie diet combined with NNMT inhibition establishes a healthier gut microbiome in obese mice Kraus et al
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If you see a small drop of blood at the injection site, that is normal