Oral supplementation of nicotinamide riboside alters intestinal microbial composition in rats and mice, but not humans
Pickart & Margolina (Biomedicines, 2018) published a comprehensive review of GHK-Cu's effects on skin biology, documenting its influence on collagen synthesis, glycosaminoglycan production, and fibroblast proliferation in cell culture models
TK Tariq Khalil
Its especially beneficial after treatments like peels or laser procedures
(See figure below showing the methylation and transsulfuration pathways.) Glutathione production starts with the amino acid cysteine

For gut healing (IBS, leaky gut, ulcers) Oral protocol (preferred for gut): Dose: 500-1,000mcg daily Method: Oral capsules on empty stomach Duration: 8-12 weeks minimum Timing: 30 minutes before breakfast Injectable protocol (alternative): Dose: 250-500mcg twice daily Method: Injectable SubQ (abdomen area) Duration: 8-12 weeks Works systemically and reaches gut Severe gut issues: Consider both oral AND injectable Oral: 500mcg morning Injectable: 250mcg twice daily Comprehensive approach For joint pain and arthritis Standard protocol: Dose: 250-500mcg twice daily Method: Injectable SubQ near affected joint Duration: 8-16 weeks Long-term use acceptable Multiple joints: Systemic dosing (not near specific joint) 500mcg twice daily Abdomen or thigh injections Reaches all joints systemically For general health and longevity Maintenance protocol: Dose: 250mcg daily Method: Injectable SubQ or oral Duration: Ongoing (can use long-term) Timing: Morning or evening Cycling: Can use continuously or cycle Example: 12 weeks on, 4 weeks off Not required (BPC-157 safe long-term) See best peptides for injury recovery and best peptides for joint pain
