What supplements are actually worth taking?
Most supplement stacks are longer than the evidence. The best case for supplements is targeted replacement, training support, or a specific symptom—not a shopping cart of longevity vibes.
Clinical answer
Short answer
The short list is boring: correct real deficiencies, consider creatine if strength training, use protein/fiber strategically when food falls short, and be cautious with anything marketed as anti-aging.
Who should consider it
People with documented deficiencies, dietary constraints, heavy training goals, pregnancy/perimenopause-specific needs, or medication/lifestyle patterns that create predictable gaps.
Who should skip or avoid it
Anyone on anticoagulants, pregnancy-related restrictions, kidney/liver disease, cancer therapy, transplant meds, or multiple prescriptions should review supplements clinically. Skip proprietary blends and mega-dose stacks.
What to measure before / after
The deficiency or outcome you are targeting: ferritin/iron studies, B12, vitamin D when relevant, lipids, glucose, symptoms, training performance, sleep, and medication interactions.
What I’d do first
Start with food, training, sleep, and alcohol/smoking. Add one supplement only when there is a reason, dose it sanely, and stop it if the target does not move.
What would change my mind
I upgrade supplements when human outcome data show meaningful benefit and low harm. I downgrade them when benefits vanish outside small biased studies or when contamination/interactions are common.
The filter
A supplement has to pass one of three tests: it fixes a deficiency, it improves a measurable outcome you care about, or it has a plausible safety/benefit profile for a specific situation. If it only passes the influencer test, no.
- Often reasonable: creatine for training, vitamin D/B12/iron when low or risk is high, fiber when diet is short, protein support when intake is inadequate.
- Context-dependent: magnesium for sleep or constipation, omega-3 in selected people, electrolytes for heavy sweating or specific diets.
- Usually noise: giant antioxidant stacks, proprietary longevity blends, detox products, and supplements whose main evidence is a mechanistic diagram.
References & citations
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