How to support your NAD+ levels without injections

Supply and demand

Most of your NAD+ is recycled rather than made from scratch. A salvage pathway takes nicotinamide released when NAD+ is used and rebuilds it, and an enzyme called NAMPT is the bottleneck in that loop. Smaller amounts come from dietary vitamin B3 and from the amino acid tryptophan.

On the demand side, several enzymes consume NAD+ as they work. DNA-repair enzymes ramp up after damage from sun exposure, smoking or other stressors. An immune enzyme called CD38, which becomes more active with age and inflammation, is a major consumer. Alcohol metabolism also uses NAD+. Lowering avoidable demand matters as much as boosting supply.

Exercise: the strongest candidate

Physical activity is the habit with the broadest proven payoff, from heart and metabolic health to mood and sleep. Laboratory and small human studies suggest exercise training also supports the machinery that recycles NAD+ in muscle, though this has not been tied to specific outcomes in large trials.

Practically, that means following the standard adult guidelines: at least 150 minutes a week of moderate aerobic activity, such as brisk walking, plus muscle-strengthening work on two or more days. Strength training matters more after 40, when muscle mass starts to decline, and muscle is a metabolically active tissue.

Food: cover the basics rather than chasing superfoods

Poultry, beef, fish, nuts, legumes and fortified grains are good sources of B3, and protein foods provide tryptophan. Most people eating a varied diet meet their needs, and true deficiency is very rare in the U.S. There is no evidence that a single food will meaningfully raise NAD+ beyond what a balanced diet already provides.

Time-restricted eating and fasting have plausible links to NAD+ biology in animal studies, but human evidence that they change NAD+ or improve aging outcomes is limited. If you enjoy an eating window and it suits your health, fine; just do not expect it to act like a drug.

• Chicken, turkey and tuna
• Salmon and other fish
• Beef and pork
• Peanuts and other legumes
• Whole and fortified grains
• Mushrooms and some green vegetables (smaller amounts)

Sleep, alcohol, sun and smoking

These are mostly about reducing unnecessary NAD+ use. Alcohol is broken down by enzymes that consume NAD+, and heavy drinking also disrupts sleep and liver health. Ultraviolet exposure and tobacco smoke damage DNA, which triggers repair enzymes that draw on NAD+.

Short or broken sleep is linked to weight gain, poor glucose control and fatigue, and circadian rhythms are tied to NAD+ cycling in cells. Aiming for seven to nine hours, treating sleep apnea if you have it, keeping alcohol low and using sun protection are all worthwhile whatever their exact effect on NAD+.

Body weight and blood sugar belong on this list too. Excess visceral fat and insulin resistance are associated with chronic low-grade inflammation, which is one of the conditions in which NAD+-consuming enzymes become more active. Steady progress on weight and glucose is good for you regardless of what it does to NAD+ specifically.

Where supplements and injections fit

Oral precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) reliably raise NAD+ in blood in human studies and appear safe in the short term. A 2023 review found that evidence for improved physiological function is still unclear, and another found few clinically relevant effects of NR. They are an add-on to good habits, not a substitute.

Compounded NAD+ injections are another option some people try. They are not FDA-approved, and there are no trials showing they work better than lifestyle changes or oral precursors. If you are considering them, a clinician can first check for treatable causes of fatigue, such as low iron, thyroid problems, low B12 or poor sleep.

A sensible order of operations

Start with the free, proven steps for at least a couple of months: move most days, lift something heavy twice a week, protect your sleep and cut back on alcohol. If you still feel flat, get basic labs to look for a specific cause. Only then consider whether a time-limited trial of a precursor or an injection is worth the cost.

HealifyMD clinicians can help with that stepwise approach. The Comprehensive Lab Panel is $199 (one-time), and the compounded NAD+ Injection starts from $199/month. There is no membership fee, and prices are confirmed at the eligibility review.