Dietary supplements are a $50 billion industry per year. Every pharmacy, every Instagram, every health podcast promises that supplement X will extend your life. What are you supposed to believe? Nutrition and health experts reviewed the existing scientific literature and separated what truly works from marketing. Here is the clear list: 4 supplements worth the money, and 4 that aren't.
4 Proven Supplements
1. Vitamin D
Vitamin D is not actually a "vitamin" but a hormone. It affects hundreds of processes in the body, from bone growth to immune system function.
The Evidence: About 40% of Americans are deficient in vitamin D. In studies, supplementation with 1,000-2,000 IU per day in those who are deficient showed:
- Reduced risk of respiratory infections
- Improved cellular aging (slowing the rate of telomere shortening)
- Improved mood in people with mild depression
- Strengthened bone density
Who It's Relevant For: Almost everyone, almost everywhere in the world. Especially those living in areas with less sun, older adults, or people with darker skin.
Dosage: 1,000-2,000 IU per day. A blood test (25-OH Vitamin D) once a year. If your level is below 30 ng/ml, you are deficient.
2. Omega-3 Fatty Acids
EPA and DHA are fatty acids that cannot be produced by the body. We need to get them from our diet.
The Evidence: Dozens of large controlled studies have shown that omega-3 reduces systemic inflammation, decreases the risk of heart disease, and aids brain function. In the large VITAL study, taking omega-3 reduced heart events by 25%.
Who It's Relevant For: Those who do not eat fatty fish (salmon, sardines, mackerel) at least 2-3 times a week.
Dosage: 1,000-2,000 mg of EPA+DHA combined per day. A quality supplement, purified from heavy metals.
3. Protein (Powder)
The term "supplement" can also include protein powder. People over 50 need more protein than younger people, and it's easier to reach the target with a supplement.
The Evidence: Adults 65+ who eat less than 1 gram of protein per kilogram of body weight per day increase their risk of sarcopenia by 50%. Supplementing with 20-30 grams per day (powder or a quality source) fills the gap.
Types:
- Whey Protein Powder: The standard. Fast absorption, good amino acid profile
- Casein: Slow absorption. Good before bed
- Plant Protein (Pea, Rice): For vegans. Combining 2 types provides a complete profile
Dosage: 20-40 grams per day if diet is insufficient.
4. Creatine Monohydrate
One of the most researched supplements in the world, with over 500 controlled studies. Previously considered only a sports supplement. Now recognized for brain function in older age.
The Evidence: Creatine increases cellular energy availability. In older adults, it has been found to:
- Improve muscle strength by 5-10% within 4-8 weeks
- Preserve muscle mass during periods of inactivity (bed rest after surgery)
- Improve working memory in older adults, arithmetic performance
- Possibly slow brain aging (early evidence)
Dosage: 3-5 grams per day, anytime. Very safe even long-term.
4 Supplements Not Worth It
1. NMN and NR (NAD+ Boosters)
NAD+ supplements are the big trend of 2020-2025. Powerful marketing, high prices, and David Sinclair recommends them.
The Problem: As we covered in an in-depth investigation, most evidence is in mice. In humans, the benefits are modest (a 2 mmHg reduction in diastolic blood pressure, minor improvement in fitness). There is no proof of lifespan extension. Additionally, a study from Case Western showed they can help cancer cells survive chemotherapy.
Recommendation: Most people will get a better ROI from regular vitamin B3 (niacin) at 5% of the supplement's cost.
2. Resveratrol
The story of resveratrol: It is found in red wine and activates sirtuins, enzymes linked to aging. In the lab, it extends the lifespan of yeast. Sinclair was its face.
The Problem: Resveratrol is not well absorbed in the human gut. Most of what you consume does not reach the cells. In human studies, it has not shown consistent benefits. Sinclair himself stopped taking it and switched to NMN.
Recommendation: Save your money, and occasionally drink a glass of red wine (if you like it). It won't save your life, but at least it tastes good.
3. High-Dose Antioxidant Supplements
Vitamin E, vitamin C, beta-carotene, selenium - all promise to reduce the risk of cancer and heart disease.
The Problem: A systematic review of studies on hundreds of thousands of patients found that high-dose antioxidants may increase mortality risk. They may interfere with healthy cell signaling. In the famous ATBC study, vitamin E and carotene themselves increased the risk of lung cancer in smokers.
Recommendation: Eat colorful vegetables. High-dose antioxidant supplements are a problem, not a solution.
4. "Longevity Blends" - Proprietary Mixtures
Many companies offer expensive bottles containing "10 vitamins, 5 minerals, and 7 active ingredients." Price: $80-150 per month.
The Problem:
- Most ingredients are in sub-therapeutic amounts (less than the dose showing benefit in studies)
- There is no research on this specific combination - only on individual ingredients
- Unknown interactions between substances
- Marketing based on "name-dropping" famous researchers, not controlled studies
Recommendation: Take the 4 proven supplements above separately, in high quality. You'll save a lot of money and get more.
Conclusion: A Smart Shopping List
If you want supplements that work:
- Vitamin D 1,000-2,000 IU - $5-10/month
- Quality Omega-3 1-2 grams - $15-25/month
- Protein Powder 1 kg - $30-40/month
- Creatine 5 grams - $5-10/month
- Total: $55-85/month for a protocol that works
That's much less than the price of a single unproven NMN supplement. And more importantly, it also leaves a budget for things that work better than supplements: quality food, a gym membership, and medical check-ups.
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