GHK-Cu is a naturally occurring copper-binding tripeptide that has drawn interest for collagen and extracellular-matrix remodeling, wound repair and regenerative signaling. Published reviews describe effects on genes associated with tissue repair and remodeling, while topical/cosmetic research has explored improvements in skin quality.

Research perspective: The positive case for GHK-Cu is its unusually broad repair-signaling profile. Evidence is strongest for topical/skin and wound-related research; claims beyond those areas should be interpreted according to the study model and formulation. Research ↗

BPC-157 has produced notable findings in animal models involving tendon, ligament, muscle and gastrointestinal tissue repair. That preclinical repair profile is the main reason it appears in discussions of tissue resilience and healthy aging.

Research perspective: The positive preclinical signal is substantial enough to justify continued research, but controlled human trials are still needed before animal repair outcomes can be assumed in people.

NAD+ is essential to cellular energy metabolism and is also used by enzymes involved in DNA repair and cellular stress responses. Age-related changes in NAD metabolism have made the pathway a major focus of longevity science.

What makes it interesting: Human studies of NAD-precursor strategies have demonstrated that NAD-related metabolites can be increased, although whether that translates into specific anti-aging outcomes is still being defined.

Glutathione is one of the body’s principal endogenous antioxidants, protecting cells from oxidative stress and helping maintain cellular redox balance. In dermatology it has been investigated for potential effects on pigmentation, skin brightness and the appearance of uneven skin tone.

Research perspective: The strength of clinical evidence varies by formulation and intended use, so findings from one product or route of delivery should not be generalized to others. Research ↗

KPV is a short peptide fragment derived from α-MSH that is studied for anti-inflammatory signaling. Preclinical research has explored its effects on inflammatory pathways, intestinal inflammation and the integrity of gastrointestinal tissues.

Research perspective: Age-related inflammation is a recurring theme in longevity research, which is why anti-inflammatory mechanisms attract interest. Most KPV evidence remains preclinical, so further human research is needed to determine whether these findings translate into meaningful clinical benefits.

TB-500 is a name used for products associated with thymosin beta-4, a naturally occurring protein involved in cell migration, tissue remodeling and wound-healing biology. Thymosin beta-4 has been investigated in preclinical and clinical research on tissue repair, angiogenesis and ocular-surface repair.

Research perspective: Commercial TB-500 should not automatically be treated as identical to every thymosin beta-4 preparation studied in the scientific literature; formulation and study model matter, and evidence for specific benefits attributed to marketed TB-500 products remains limited.

Delta sleep-inducing peptide (DSIP) is a short peptide originally investigated for its possible relationship with sleep regulation. Research has explored its potential influence on sleep patterns, neuroendocrine activity and stress-related responses, which links it to the role of sleep and circadian health in healthy-aging research.

Research perspective: Findings have been inconsistent, and its effectiveness as a treatment for insomnia or as a means of improving restorative sleep has not been firmly established.