GHK-Cu, NAD+ and Glutathione for Longevity

Interest in longevity wellness has moved beyond ordinary vitamins. GHK-Cu, NAD+ and glutathione now appear in skincare products, supplements, IV infusions and personalized “anti-aging” protocols.

But popularity is not proof.

The short answer is that all three compounds have legitimate biological roles, yet the strength of the human evidence varies considerably:

• GHK-Cu has promising laboratory research and limited human evidence, mainly involving topical skin applications. Evidence for injectable GHK-Cu is insufficient.

• NAD+ precursors can increase NAD-related metabolites in humans, but they have not been proven to slow human aging or extend lifespan.

• Glutathione is a central antioxidant produced by the body. Some oral products can raise glutathione levels, but broader longevity benefits remain uncertain.

• Injectable or IV treatments introduce additional safety, sterility and regulatory concerns.

These therapies should be viewed as emerging wellness interventions—not proven replacements for exercise, sleep, nutrition, preventive medicine or treatment of disease.

What is GHK-Cu?

GHK-Cu, also called copper tripeptide-1, is a complex formed when the naturally occurring peptide glycyl-L-histidyl-L-lysine binds copper.

Researchers are interested in GHK-Cu because laboratory and animal studies suggest it may influence:

• Collagen and extracellular-matrix production

• Tissue remodeling

• Wound repair

• Inflammatory signaling

• Antioxidant defenses

• Gene-expression pathways associated with cellular repair

These mechanisms make GHK-Cu especially interesting for skin aging and regenerative medicine. However, a plausible mechanism does not automatically translate into a meaningful clinical benefit.

Does GHK-Cu improve aging skin?

Topical GHK-Cu has more support than injectable use, but the evidence is still relatively limited.

Small cosmetic studies summarized in scientific reviews have reported improvements in measures such as skin firmness, density, fine lines and photodamage. However, many of these studies are older, small or difficult to evaluate independently.

In a randomized study involving patients who underwent CO₂ laser resurfacing, topical GHK-Cu did not produce significant objective improvements in redness, wrinkles or overall skin quality compared with the control regimen. Patient satisfaction was higher, but only 13 participants completed the study.

A new Phase 2 trial is evaluating topical GHK-Cu for acute wound healing, but results have not yet been reported.

Evidence verdict: Topical GHK-Cu is biologically plausible and may support cosmetic skin quality, but it should not be described as a proven systemic anti-aging treatment.

What is NAD+, and why is it connected to longevity?

Nicotinamide adenine dinucleotide, or NAD+, is an essential molecule involved in:

• Cellular energy metabolism

• Mitochondrial function

• DNA repair

• Stress-response signaling

• Enzymes such as sirtuins and PARPs

NAD+ metabolism can change with age, illness and metabolic stress. This has led to interest in increasing NAD+ through precursors such as nicotinamide riboside, or NR, and nicotinamide mononucleotide, or NMN.

What is glutathione?

Glutathione is a tripeptide made from cysteine, glycine and glutamate. It is one of the body’s principal intracellular antioxidants and helps:

• Neutralize reactive molecules

• Recycle other antioxidants

• Support detoxification enzymes

• Maintain cellular redox balance

• Protect proteins and membranes from oxidative stress

The liver produces glutathione naturally. Its status can be influenced by diet, health conditions, medications, alcohol exposure and oxidative stress.

What has the strongest evidence for healthy aging?

No peptide or infusion currently replaces the fundamentals associated with healthier aging:

• Regular aerobic and resistance exercise

• Adequate sleep and treatment of sleep disorders

• A nutrient-dense dietary pattern

• Avoiding tobacco

• Moderate or no alcohol consumption

• Blood-pressure, cholesterol and glucose management

• Vaccination and evidence-based cancer screening

• Maintaining social connection and cognitive activity

Emerging therapies can be studied alongside these foundations, but they should not distract from interventions already linked to better health outcomes.

References

1. Campbell MD, et al. Dietary supplementation with NAD+-boosting compounds in humans: current knowledge and future directions. The Journals of Gerontology. 2023. PubMed

2. Brakedal B, et al. NAD+ supplementation for anti-aging and wellness: a PRISMA-guided systematic review of preclinical and clinical evidence. 2026. PubMed

3. Miller DM, et al. Effects of topical copper tripeptide complex on CO₂ laser-resurfaced skin. Archives of Facial Plastic Surgery. 2006. PubMed

4. Pickart L, Margolina A. The potential of GHK as an anti-aging peptide. Biogerontology. PubMed Central

5. ClinicalTrials.gov. Topical GHK-Cu Gel for Acute Skin Wound Healing, NCT07437586. ClinicalTrials.gov

6. Richie JP Jr, et al. Randomized controlled trial of oral glutathione supplementation on body stores of glutathione. European Journal of Nutrition. 2015. PubMed

7. U.S. Food and Drug Administration. FDA highlights concerns with using dietary-ingredient glutathione to compound sterile injectables. FDA

8. U.S. Food and Drug Administration. Bulk drug substances nominated for use in compounding under Section 503A. Updated May 14, 2026. FDA document

9. U.S. Food and Drug Administration. GenoGenix LLC warning letter, January 20, 2026. FDA