NAD+ vs Thymalin

A detailed comparison to help you understand the differences and choose the right peptide for your research goals.

NAD+

Nicotinamide Adenine Dinucleotide (NAD+) is an essential coenzyme found in every living cell. It plays a central role in energy metabolism, DNA repair, gene expression, and cellular signaling. NAD+ levels naturally decline with age, and restoring them has become a major focus of longevity research. Injectable NAD+ bypasses the GI tract for higher bioavailability compared to oral precursors like NMN or NR.

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Thymalin

Thymalin is a polypeptide preparation derived from calf thymus. Developed in Russia, it has been used for decades to support immune function and has shown potential anti-aging effects in long-term studies.

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Side-by-Side Comparison

Aspect	NAD+	Thymalin
Dose Range	20 mg–120 mg	5 mg–10 mg
Frequency	Less than daily	1x daily
Cycle Length	4–12 weeks	1–2 weeks
Route	subcutaneous	intramuscular
Mechanism	NAD+ is a critical substrate for sirtuins (SIRT1-7), a family of enzymes involved in DNA repair, inflammation regulation, and mitochondrial function. It also serves as a coenzyme for PARP enzymes (involved in DNA damage repair) and CD38 (involved in immune cell signaling). By directly replenishing cellular NAD+ pools, injectable NAD+ supports mitochondrial electron transport chain function, enhances ATP production, and activates longevity-associated pathways.	Regulates the ratio of T-cell subpopulations, stimulates cellular immunity, and enhances phagocytosis. Also affects neuroendocrine regulation and may influence melatonin production.
Typical Dosage	Subcutaneous injection, typically 2–3 times per week. Start low and escalate: Twice per week protocol: Week 1: 20 mg (0.1 ml), Week 2: 40 mg (0.2 ml), Week 3+: 120 mg maintenance (0.6 ml). Three times per week protocol (e.g. Mon/Wed/Fri): Week 1: 20 mg (0.1 ml), Week 2: 40 mg (0.2 ml), Week 3+: 80 mg maintenance (0.4 ml). Volumes above assume 200 mg/ml concentration (100 mg vial reconstituted with 0.5 ml BAC water). Inject slowly — rapid administration increases flushing and nausea. Avoid back-to-back injection days. IV infusion (clinical setting): 250–750 mg per session over 2–4 hours.	Clinical protocols: 5-20mg daily intramuscularly for 3-10 days. Often cycled 1-2 times per year for maintenance.
Administration	Subcutaneous injection is the most practical route for self-administration. Inject slowly — rapid administration increases side effects (flushing, chest tightness, nausea). Some users split larger doses across multiple daily injections to improve tolerance. IV infusions provide the highest bioavailability but require a clinical setting. Store reconstituted NAD+ refrigerated and protect from light. NAD+ solutions are pH-sensitive; use bacteriostatic water for reconstitution.	Intramuscular injection. Usually administered in short courses rather than continuously. Often combined with Epithalamin for anti-aging protocols.
Side Effects	Flushing and warmth (very common, especially at higher doses or fast injection rates). Nausea and mild GI discomfort. Chest tightness or pressure during injection (usually transient). Injection site pain or redness. Headache. These side effects are typically dose-dependent and diminish with slower administration and repeated use.	Generally well-tolerated. May cause injection site reactions or temporary flu-like symptoms as immune function is modulated.
Best For	Anti-Aging & Longevity Cognitive Performance Recovery & Healing	Immune Support Anti-Aging & Longevity