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Longevity

Clinician-reviewed articles on treatments, costs, and what to expect — so you can make informed decisions at every step.

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NAD+ side effects logo
Longevity14 min readFact Checked

NAD+ Side Effects: Risks, Contraindications, and Safety

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell. It helps transfer electrons during reactions that convert carbohydrates, fats, and proteins into ATP, the cell’s usable energy. It also supports enzymes involved in DNA maintenance, gene regulation, and cellular signaling. NAD+ is the oxidized form that accepts electrons, while NADH is the reduced form that carries them; the body continually converts one into the other.

Longevity13 min readFact Checked

What Is NAD+ Used For? Functions, Supplements, and Evidence

NAD+ is used throughout the body to help convert nutrients into cellular energy and to support enzymes involved in DNA repair, metabolic signaling, and other essential cell functions. These biological roles are well established, but they do not mean that NAD+ supplements, injections, or IV therapy are proven to improve energy, weight loss, longevity, or other wellness outcomes. Evidence for commercial NAD products varies by ingredient and delivery method.

Woman with nasal spray in modern bathroom
Longevity6 min readFact Checked

NAD+ Nasal Spray Side Effects: a Complete Guide

Nicotinamide adenine dinucleotide (NAD+) is a naturally occurring coenzyme involved in cellular energy production and DNA repair. In recent years, wellness clinics have introduced NAD+ nasal spray as a noninvasive alternative to injections or oral supplements. Instead of swallowing a pill or receiving an infusion, users inhale a fine mist of NAD+ solution into the nasal passages. This approach leverages the rich blood supply in nasal tissue to enable faster uptake into the circulation.

A man taking NAD+ in the morning
Longevity6 min readFact Checked

Best Time To Take NAD+: Timing for Maximum Efficacy and Safety

Determining the best time to take NAD+ can influence energy production, cellular repair, and overall well-being. This article reviews current evidence on circadian rhythms, dosing strategies, safety considerations, and potential metabolic benefits.

A doctor consulting a patient about Epitalon peptide
Longevity11 min readFact Checked

Epitalon Peptide: Uses, Research, Benefits, and Safety

Epitalon peptide, also known as epithalon, is a synthetic tetrapeptide made from four amino acids: Ala-Glu-Asp-Gly. It was developed as a standardized version of compounds associated with epithalamin, a pineal extract studied in aging, sleep, and circadian rhythm research.

Photo of people with NAC
Longevity11 min readFact Checked

NAD vs NAC: What’s the Real Difference Between These Supplements?

NAD and NAC are not interchangeable supplements. NAD+ (nicotinamide adenine dinucleotide) is a coenzyme involved in cellular energy metabolism, DNA repair, and signaling, while NAC (N-acetylcysteine) is an amino acid derivative best known for helping the body produce glutathione. In practical terms, NAD-related products are generally discussed in the context of cellular energy and aging research, whereas NAC is more closely associated with antioxidant support and specific medical uses.

Photo of NAD supplements
Longevity8 min readFact Checked

Benefits of NAD Supplement: What NAD+ Does for Energy, Aging, Cognitive Function, and Cellular Health

NAD+ (nicotinamide adenine dinucleotide) has become a buzzword in longevity and wellness circles because it sits at the heart of cellular energy, repair, and aging. As we get older, natural NAD+ levels fall, and that decline is tied to slower metabolism, less effective DNA repair, and signs of aging in tissues like skin, muscle, and brain. Supplementing with NAD or its precursors is marketed as a way to push back on those declines—supporting energy, cognition, and overall cellular resilience. Early human and preclinical studies suggest there may be real benefits, though the evidence is still emerging and context matters. “What is NAD supplement?” and “what does NAD do for the body?” are questions people ask because boosting NAD+ touches on everything from fatigue to age-related metabolic shifts.

The doctor explaining a patient what are side effects of NAD injections
Longevity12 min readFact Checked

NAD Injection Side Effects: What Every Patient Should Know Before Treatment

NAD injections and intravenous (IV) NAD+ infusions are increasingly marketed in wellness settings for goals such as energy, cognition, recovery, and healthy aging. However, evidence for these clinical benefits remains limited, and injectable NAD+ products are not FDA-approved treatments for these purposes.

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