Sifting through scientific literature to separate supplement hype from reality is no small task.
Yet one dedicated researcher spent an entire year doing exactly that, analyzing 11 popular supplements across dozens of studies to determine which ones actually deliver on their promises.
The results? Some supplements earned top marks while others fell disappointingly short.
In a recent comprehensive video breakdown, the researcher graded each supplement based on two critical factors: strength of scientific evidence and actual effect size—because a supplement backed by studies means nothing if the real-world impact is negligible.
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The Gold Standard: Top-Tier Supplements That Delivered
Creatine Maintains Its Crown
Creatine emerged as the clear winner, earning an A grade for physical performance enhancement.
The researcher examined its effects specifically in older individuals, looking at bone health, muscle mass, and strength. While one analysis showed no benefit for bone health, another demonstrated clear advantages for muscle mass and strength even in aging populations.
If we pair that with the mountain of evidence in favor of creatine for younger individuals too, there’s excellent science indicating it provides a moderate benefit to physical performance at least resistance training and high-intensity performance.
What sets creatine apart is the wealth of evidence combined with moderate effects across multiple metrics. It’s not just studied—it’s thoroughly studied, with consistent results.
Lutein and Zeaxanthin: Eye Health Heroes
These two molecules working together also received an A grade for eye health.
Across six studies and scientific reviews, the consistency was remarkable. Not only do they provide long-term eye protection, but they also improve eye function in measurable ways.
The synergistic relationship between lutein and zeaxanthin means they work slightly differently but complement each other perfectly. Studies consistently use them together for this exact reason.
Strong Performers: B-Grade Supplements Worth Considering
Omega-3s Show Cardiovascular Protection
After analyzing nine studies—many of which were meta-analyses including up to 30 studies—omega-3s earned a B grade for heart health.
Evidence consistently shows omega-3s from fish oil reduce heart disease risk in people already living with heart disease. The effect ranges from small to moderate but appears across rigorous analyses, including those from the Cochrane Library.
However, there’s a complication: some evidence suggests omega-3s might increase risk of irregular heart rhythms called atrial fibrillation. This point remains debated, but interestingly, even with this possible concern, omega-3s still provide overall cardiovascular protection.
Taurine’s Metabolic Benefits
Taurine received a B grade for metabolic syndrome—a cluster of conditions including diabetes, obesity, and cardiovascular disease.
One meta-analysis covering 25 randomized controlled trials identified multiple benefits:
- Blood pressure reduction
- Decreased blood triglycerides
- Likely blood sugar reduction
Effects were mild, but appearing across multiple measures strengthens the case. The downside? Significant inconsistency across studies suggests more research is needed to determine who benefits most—perhaps those with heart disease versus those with obesity alone.
Beta-Alanine: Specific But Effective
Beta-alanine earned a B grade for physical performance after analysis of two meta-analyses covering up to 40 studies.
The evidence convincingly shows beta-alanine improves physical performance, but with important caveats. Benefits only appear for specific activities: intense exercises lasting more than 30 seconds but too intense to sustain beyond 10 minutes.
Think sprints lasting several minutes that completely exhaust muscles. Outside this narrow window? Limited benefit.
Middle Ground: C-Grade Supplements With Modest Evidence
Glycine for Sleep Needs More Data
Glycine received a C grade for sleep after reviewing all available human studies to date—four in total.
All four studies indicated glycine’s effectiveness for sleep, showing consistency. However, most studies had industry affiliations, raising potential bias concerns. Additionally, while consistent, effect sizes were relatively small.
Berberine Shows Promise for Diabetes
Berberine landed at a C grade for metabolic disorders, though the researcher acknowledged it could arguably deserve a B.
One meta-analysis (after discarding another poorly conducted one) suggested berberine benefits people with type 2 diabetes by:
- Reducing HbA1c and blood sugar
- Improving insulin sensitivity
- Decreasing blood fats
The limitation? Many studies weren’t gold-standard randomized controlled trials with placebo controls. Conclusions remain limited to people with type 2 diabetes; applicability to others remains unconfirmed.
Lion’s Mane: It Depends Who You Are
Lion’s mane mushroom presented a complex picture for cognitive function, resulting in a split score.
For healthy young individuals with good sleep and no cognitive issues: D grade. One study showed benefits, but the effect size was minuscule. Other studies showed improvements in some cognitive measures alongside worsening in others, or simply no effect.
For people with cognitive impairment—from sleep problems to dementia: C grade. Evidence becomes more promising in these populations.
Disappointing Performers: Lower-Grade Supplements
Astaxanthin’s Skin Benefits Remain Uncertain
Astaxanthin received a D grade for skin health after reviewing one analysis of 11 studies.
Across three measurements of skin health and aging, astaxanthin provided benefits in two out of three. Sounds decent, right? Not quite. Significant inconsistency across studies weakened conclusions, and not all studies were high quality.
All considered it seems that astaxanthin might help our skin but it wouldn’t be my go-to and the research needs some work.
Niacin’s Cardiovascular Claims Fall Short
Niacin received varied grades depending on the specific cardiovascular outcome assessed.
For reversing arterial plaque: F grade. Two studies examining atherosclerosis reversal produced conflicting results. One showed strong positive effects; another found nothing. The more rigorous study found no effect, possibly due to dosage issues.
For blood pressure: C grade. Multiple studies indicate mild improvements.
For other cardiovascular outcomes: D grade. Effect sizes were small with substantial uncertainty.
Prioritizing Supplements: Where to Invest Your Money
If limited budget or capacity forces choosing just one supplement, creatine takes top priority. Want to expand? Add lutein and zeaxanthin, then omega-3s at lower doses (around one gram or less).
Beyond those four, taurine represents the next best investment. Skip everything else unless addressing specific conditions where evidence is stronger.
Not because they don’t work but because if you have a limited budget or just don’t want to be taking pills and powders these will provide the biggest bang for your buck.
These recommendations remain limited to outcomes assessed in this particular analysis. Ratings may change as new research emerges and as the researcher continues investigating additional health outcomes throughout the coming year.
