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Intestinal microbiota in cardiovascular health and disease: JACC State-of-the-Art Review
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
Xu, M., Yu, Y
L-arginine more commonly causes gastrointestinal issues, including diarrhea, nausea, and abdominal pain, particularly at higher doses
Because it stimulates the bodys own growth hormone production, dosing needs to stay within physiologic limits to avoid excess IGF-1. If levels climb too high, she notes, you might get symptoms such as fluid retention, joint stiffness, carpal tunnellike numbness, or mild insulin resistance, though these effects are uncommon with conservative dosing and regular monitoring
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