NAD⁺ vs. NAC – An express guide to start your longevity journey

Many people, when they start looking after themselves “from the inside”, come across a whole host of names and acronyms — NAD, NAC, NR, NMN… — that sound similar and can be rather confusing. So you don't get lost among so many terms, today we're clarifying two of the most popular ones in the world of longevity: NAD⁺ and NAC.

NAD⁺ vs. NAC – An express guide to starting your longevity journey

1. What is each one?

	NAD⁺ (Nicotinamide Adenine Dinucleotide)	NAC (N-Acetyl-Cysteine)
Nature	Coenzyme present in every cell	Stable derivative of the amino acid cysteine
Key function	Electron transfer → mitochondrial energy production (ATP) and DNA repair	Cysteine donor → stimulates glutathione synthesis, the body's main cellular antioxidant
Ageing	Levels drop by ~1% a year ⇢ less energy and more cellular damage	Helps neutralise free radicals and maintain liver and respiratory health

2. Benefits backed by science

NAD⁺

1. More cellular energy: boosts mitochondrial function and physical performance.

2. DNA repair: activates sirtuins (SIRT1-7), which correct genetic damage linked to ageing.

3. Healthy metabolism: improves insulin sensitivity and lipid control.

4. Neuroprotection: supports brain health and may slow cognitive decline.

NAC

1. Powerful indirect antioxidant: raises glutathione levels, reducing oxidative stress.

2. Liver detox and lung protection: used clinically for paracetamol overdose and chronic respiratory conditions.

3. Immune support: modulates inflammatory cytokines, useful in viral infections and chronic inflammatory states.

4. Brain health and mood: may help balance neurotransmitters (glutamate) and support mental wellbeing.

3. Foods (or precursors) where you can find them

To boost NAD⁺	To boost NAC / Cysteine
▸ Oily fish (tuna, salmon) – rich in niacin (B3), a precursor of NAD⁺	▸ Turkey, chicken, pork – high in cysteine
▸ Beef and chicken liver	▸ Eggs (especially the white)
▸ Peanuts, sunflower seeds	▸ Lentils, chickpeas
▸ Avocado, dates	▸ Garlic, onion, broccoli, kale
▸ Nutritional yeast	▸ Natural yoghurt, cottage cheese

Tip: coffee and green tea contain polyphenols that help preserve NAD⁺ by inhibiting the enzymes that break it down.

4. Supplement or diet alone?

• NAD⁺

  • Direct supplements: NR (Nicotinamide Riboside) or NMN (Nicotinamide Mononucleotide) are absorbed better than classic niacin.

  • When to consider it: persistent lack of energy, athletes, people over 40.

• NAC

  • Typical dose: 600–1200 mg/day during periods of high oxidative stress (pollution, smoking, intense exercise).

  • Caution: may interact with anticoagulants; consult your doctor.

5. Quick summary

• NAD⁺ recharges your cells' “batteries” and repairs, while NAC cleanses and protects.

• Together they form a powerful duo: more energy + less oxidative damage.

• Start with real food rich in niacin and cysteine; then consider supplements based on your longevity goals.

The best products

LifeXpan® NR 60 is an advanced and unique form of vitamin B3, designed to combat ageing and fatigue. By adding it to your daily routine, you can raise your NAD+ levels, essential for cellular energy and mitochondrial health.

And for NAC

Our N-Acetyl-Cysteine (NAC) supplement, 600 mg (60 capsules), is an advanced formula designed to maximise the production of glutathione, the body's “master antioxidant”. As we age, our glutathione levels decline, increasing the risk of oxidative stress and inflammatory processes that accelerate ageing and compromise health. Our product is formulated to support respiratory and liver health as well as the immune system, making it especially useful for older adults, smokers and people with specific antioxidant support needs.

Studies and meta-analyses have shown that NAC not only improves lung function and reduces the frequency of exacerbations in respiratory conditions, but may also play a complementary role in mental health and in reducing cravings in addiction. What's more, by promoting optimal mitochondrial function and reducing inflammation, NAC stands out as an ally in healthy ageing and longevity strategies.