Peptides for Anti-Aging: GH Secretagogues, NAD+, and the Longevity Axis

How Aging Shifts the GH and NAD+ Axes

"Anti-aging" is a marketing term, not a medical one. What physicians can actually measure and influence are the specific biological systems that decline with age. Two of the best-characterized are the growth-hormone/IGF-1 axis and cellular NAD+ metabolism. Growth hormone output falls steadily from early adulthood, and this decline tracks with reduced lean mass, slower tissue repair, and shifts in body composition.[1

In parallel, levels of NAD+ — a coenzyme central to mitochondrial energy production and to the sirtuin enzymes involved in cellular maintenance — drop measurably with age.[4 Peptide therapy for aging is not about chasing youth; it is about supporting these declining systems under physician supervision, with realistic, lab-anchored goals.

GH Secretagogues and Age-Related Decline

GH-secretagogue peptides — such as CJC-1295, Ipamorelin, and Sermorelin — prompt the pituitary to release more of the body's own growth hormone in its natural pulsatile pattern, rather than introducing synthetic hormone.[3 In older adults, oral ghrelin-mimetic secretagogues have been shown to improve body composition, increasing lean mass while the drug is continued.[2

For patients whose primary goal is muscle preservation, our guide to GH peptides for lean muscle covers the same secretagogues in more depth. Where recovery and tissue repair are the priority, see peptides for healing and recovery.

NAD+, Sirtuins, and Cellular Aging

NAD+ sits at the center of energy metabolism and activates the sirtuin family of enzymes that regulate DNA repair and cellular stress responses.[5 Because NAD+ availability falls with age, NAD+ precursor support is frequently discussed alongside peptide protocols in a longevity context.[6

NAD+ precursors are not peptides, and the two are not interchangeable — they act on different pathways and are sometimes used together. For the underlying biology, read our explainer on NADH and cellular energy. Popular longevity compounds carry their own trade-offs; our review of resveratrol side effects for men covers one common example.

What Peptides Can and Can't Do for Aging

No peptide reverses aging or extends lifespan in humans — claims to that effect are not supported by clinical evidence. What physician-supervised protocols can realistically target are the measurable downstream effects of age-related GH and NAD+ decline: body composition, recovery capacity, and energy. Progress is confirmed with objective testing, including a DEXA body-composition scan, rather than by how a patient feels alone.

How Anti-Aging Protocols Are Designed

Every Strong Health protocol begins with a physician evaluation and baseline labs — including IGF-1, metabolic, and hormone panels — so therapy is matched to the patient's actual biology and goals. Protocols are individualized, monitored on a schedule, and adjusted based on lab response. GH-secretagogue peptides are commonly combined with testosterone therapy or with body-composition programs when the clinical picture supports it, all designed and monitored by the same physician.

Safety, Monitoring, and Contraindications

GH-secretagogue peptides are generally well tolerated under supervision; the most common side effects are mild and protocol-specific, such as transient water retention or increased hunger. Contraindications include active malignancy and certain endocrine disorders, and IGF-1 is monitored on an ongoing basis. Some longevity compounds have estrogenic or drug-interaction effects that warrant caution in men.[7 Physician screening at intake is essential. You can browse every protocol in our peptide therapy hub.