I Researched 100+ Supplements: The Truth About What Actually Works
What this episode covers
- Siim Land, an Estonian author and longevity researcher, synthesizes five years of supplement research into a tiered framework: supplements with consistent human RCT support, supplements without convincing data, and promising-but-unproven supplements requiring more research.
- Specific picks include creatine, omega-3, ashwagandha, glycine, NAC, and turmeric in the top tier; BCAAs, beta-carotene, tribulus, and oral glutathione in the no-evidence tier; spermidine, NMN, urolithin A, and senolytics in the promising tier.
Why it matters
Supplement marketing claims hugely outpace the underlying evidence. Knowing how to read the evidence tier of a given supplement — multiple human RCTs vs animal studies vs anecdote — is a more durable skill than memorizing which specific supplements to take. This episode is essentially a methodology lesson disguised as a tier list.
Best-supported action
The single highest-leverage move from this episode, anchored in the strongest evidence the speaker presents.
Audit your current supplement stack against evidence quality. Identify supplements supported primarily by animal studies, mechanisms, or marketing claims rather than multiple human trials, and consider whether they still deserve a place in your stack.
Where to start
Small low-friction starters covering the main moves from this episode.
- Audit your current supplement stack against evidence quality. Identify supplements supported primarily by animal studies, mechanisms, or marketing claims rather than multiple human trials, and consider whether they still deserve a place in your stack.
Other supported actions
Further actions discussed in this episode, ordered from strongest to weakest evidence. This is one expert's view, the full topic compares and ranks across experts.
- Before buying any new supplement, check whether it has multiple human RCTs supporting the specific outcome you want — not just animal studies or mechanistic plausibility. Many popular supplements fail this test.
- If you supplement vitamin D, magnesium, or zinc without bloodwork showing deficiency, the evidence for added benefit is weak. Get a baseline test before assuming a supplement is doing anything.
Full context, impact ratings, and timing — available in related topics
Questions to take to your doctor
- Given my current bloodwork, am I actually deficient in vitamin D, magnesium, zinc, B12, or iron — or would supplementation just be insurance?
- Given my current medications, are there interactions I should watch with garlic, berberine, NAC, or any other supplement I'm taking?
- Given my cardiovascular risk profile, would omega-3 supplementation at 500 mg or 1 g per day be clinically meaningful for me?
- Given my training routine and protein intake, is creatine likely to make a meaningful difference for me, or am I already capturing most of the available adaptation?
- Given my interest in longevity supplements (NMN, urolithin A, resveratrol), where do you stand on the current evidence vs cost?
Full doctor prep with ranked questions available in the full topic page
Context
Independent author and health educator focused on longevity, nutrition, and human performance. Land's approach emphasizes evidence hierarchy, human clinical trials, and cost-benefit analysis rather than maximizing the number of supplements taken. He is not a practicing physician or academic researcher, but his framework is built around evaluating the strength of available evidence and distinguishing established interventions from emerging ones.
This episode does not prove that any specific supplement will produce clinically meaningful effects for any specific person, that supplement effects translate equally across baseline status (deficient vs adequate), or that the absence of large RCT evidence means a supplement is useless — some emerging supplements may simply be under-studied. Land's tier list reflects his synthesis as of recording and the evidence base continues to evolve.
Where people go wrong
- Stacking many supplements based on social media rather than a tier-list approach.Most of the dollar value of a large supplement stack is wasted on items with weak or no human RCT evidence, while the strongest-evidence items often get under-dosed or missed.
- Supplementing vitamin or mineral nutrients without confirming deficiency first.If you're not deficient, the evidence for additional benefit from vitamin D, magnesium, or zinc supplementation becomes less certain and more context-dependent. Baseline testing may help determine whether supplementation is likely to be useful.
What to expect over time
- First 2-4 weeksConduct the supplement audit. Get baseline bloodwork if relevant (vitamin D, ferritin, B12, magnesium RBC, omega-3 index). Decide which tier-1 supplements actually match your goal and current biomarkers.
- Months 2-3Most top-tier supplements with meaningful effects (creatine, omega-3, vitamin D in deficient individuals, ashwagandha) start showing measurable effects in this window. Effects of magnesium on sleep and stress also typically manifest within this period if deficiency was real.
- Months 6-24+Long-term effects of consistent top-tier supplementation are modest at the individual level. Sustained benefit depends more on diet and exercise quality than on the supplement stack itself.