Best Supplements for Men Over 40

After 40, testosterone declines 1-2% per year, NAD+ drops, and metabolic health becomes more vulnerable. These are the evidence-backed supplements that address these specific changes.

1. Creatine Monohydrate (Tier S) — 5g/day

Brain creatine declines with age. Rae et al. 2003 showed creatine improved working memory and processing speed. Essential for men over 40 doing any resistance training. Also reduces mental fatigue. 5g/day, any time.

2. Vitamin D3 + K2 (Tier S) — 5000IU + 100mcg

Vitamin D deficiency is extremely common in men over 40 and directly linked to testosterone reduction, immune decline, and mood disorders. D3 at 5000IU with K2 MK-7 at 100mcg, with breakfast containing fat.

3. Omega-3 rTG (Tier S) — 2g EPA+DHA/day

Cardiovascular risk increases after 40. The REDUCE-IT trial showed high-dose omega-3 reduced major cardiovascular events by 25%. 2g EPA+DHA in rTG form with the largest meal of the day.

4. Tongkat Ali Physta (Tier A) — 200mg/day

Tambi et al. 2012: 200mg Physta extract daily for one month increased total testosterone by 46.8% in men with late-onset hypogonadism. Reduces SHBG allowing more free testosterone. Take in the morning fasted.

5. Ashwagandha KSM-66 (Tier A) — 300-600mg PM

Cortisol and testosterone are inversely related. Ashwagandha reduces cortisol by 27.9% (Chandrasekhar 2012) allowing testosterone to rise. Wankhede et al. 2015: 96 ng/dL testosterone increase in resistance training men vs 18 ng/dL placebo.

6. Berberine HCl (Tier A) — 500mg 3x/day with meals

Metabolic syndrome risk accelerates after 40. Berberine activates AMPK (same as metformin), reducing blood glucose, LDL, and triglycerides. Zhang et al. 2008: matched metformin for HbA1c reduction in an RCT.

7. NMN (Tier B+) — 500mg/day AM

NAD+ declines 50% between ages 20 and 40. Yoshino et al. 2021 (Science): 250mg NMN daily increased skeletal muscle NAD+ and improved insulin sensitivity. 500mg sublingual in the morning.

8. Magnesium Glycinate (Tier S) — 400mg PM

73% of adults are deficient. Sleep quality, testosterone production, and recovery all depend on adequate magnesium. 400mg glycinate 30-45 min before bed.

The Core Daily Protocol

Berberine 500mg 3x/day before each main meal.

Longevity Stack Full Protocol

Tongkat Ali Full Review

NMN Full Review

All Evidence-Ranked Reviews

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