This article summarizes published peptide research. All content is presented for research reference only and is not intended as medical advice or guidance for personal peptide use. Products referenced are research compounds — not for human consumption, diagnostic or therapeutic application.

Poor sleep wrecks everything. Recovery, hormones, cognition, body composition. And after 40, sleep quality tends to deteriorate even in people who "do everything right." Three peptides target sleep through different biological pathways, and understanding which pathway is your bottleneck determines which peptide helps.

Epithalon: melatonin and pineal gland

Epithalon is a synthetic tetrapeptide based on epithalamin, a pineal gland hormone. The pineal gland produces melatonin, the master regulator of your sleep-wake cycle. Melatonin production declines significantly with age, often starting around 40-50.

Khavinson's research (2003) showed epithalon restored melatonin production in elderly subjects, improving circadian rhythm regularity and sleep quality. The study measured cortisol rhythm normalization and subjective sleep improvements over a 10-day treatment course.

Protocol: 10mg total over 10-20 days (typically 1mg/day for 10 days or 0.5mg/day for 20 days). Repeat 1-2 times per year. Available in 10mg and 50mg vials.

Best for: age-related sleep deterioration, circadian rhythm disruption, jet lag recovery, shift workers.

Ipamorelin: GH pulse timing

Growth hormone peaks during deep (Stage 3/4 NREM) sleep. Ipamorelin stimulates GH release, and when dosed before bed (200-300mcg subcutaneously, 30 minutes pre-sleep on empty stomach), it amplifies this natural nocturnal GH pulse.

The connection works both ways: higher GH during sleep improves sleep depth, and deeper sleep produces more GH. Ipamorelin's pre-bed dose creates a positive feedback loop. Many users report noticeably deeper sleep and more vivid dreams within the first week.

Best for: light sleepers, people whose sleep feels unrefreshing despite adequate duration, athletes who need optimized recovery sleep.

NAD+: circadian gene expression

NAD+ fuels sirtuins (SIRT1 specifically) that regulate CLOCK and BMAL1, the core circadian clock genes. When NAD+ levels are insufficient, the molecular clock loses precision. You feel tired at wrong times, alert when you should be winding down.

Preclinical data shows NAD+ supplementation improved circadian gene cycling in aged animals. The mechanism: SIRT1 needs NAD+ to deacetylate PER2 (a key clock protein). Without enough NAD+, PER2 acetylation increases and the clock drifts.

Best for: people with disrupted circadian rhythm, those who can't fall asleep at consistent times, night owls trying to shift earlier, anyone with age-related NAD+ decline affecting multiple systems.

Combining for sleep

These three work through different mechanisms and can be combined:

• Epithalon courses (twice yearly) to restore melatonin production capacity
• Ipamorelin pre-bed dose (during 8-12 week cycles) for deep sleep enhancement
• NAD+ ongoing for circadian clock gene support

Not sure which sleep pathway is your issue? Reach out to us and we'll help narrow it down.

This article is for educational purposes. Peptides are intended for research use. Consult a healthcare professional before starting any protocol.