NAD+ (nicotinamide adenine dinucleotide) isn't a peptide in the strictest sense, but it travels in the same longevity and wellness circles, so it's worth including
[30] This guidance remains relevant, if not more so, during treatment with agents that affect the gastrointestinal tract
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Journal of Veterinary Diagnostic Investigation, 22(2), 200209
I'm thrilled with the results and won't even consider using anything else