Best Supplement Guides & Product Comparisons
Each guide compares the products FactoWiki has reviewed in one category, using the same evidence-first criteria. The guides are desk-based, contain no affiliate purchase links, and say plainly when no product in a category has strong evidence.
How products are selected and ordered
- Human evidence for the main ingredients — systematic reviews and randomised trials measuring real outcomes.
- Meaningful, disclosed doses — whether studied ingredients appear near studied amounts.
- Formula transparency — one consistent label versus proprietary blends or conflicting versions.
- Safety and interactions.
- Category relevance — whether the formula matches its marketing.
- Marketing claims — unsupported or drug-like claims count against a product.
- Price, value and refund terms — considered last.
No numerical scores are used, and commissions do not affect order. Ingredient research is never treated as proof that a finished product works. Full details: how we review.
Brain, nerves and hearing
Best Brain and Memory Supplements: 7 Formulas Compared on Evidence, Doses and Safety
What matters most in a memory supplement is whether the few ingredients with human evidence — mainly citicoline, standardised Bacopa monnieri and phos…
Read the guide →Nerve HealthBest Nerve Support Supplements: 5 Formulas Compared on ALA, B12, PEA and Safety
In nerve support supplements, what matters most is whether a formula contains the few ingredients with human evidence — alpha-lipoic acid (ALA) for di…
Read the guide →Hearing & TinnitusBest Tinnitus Supplements: 6 Hearing and Balance Formulas Compared on Evidence and Safety
What matters most with tinnitus supplements is understanding that none has been shown to cure or reliably reduce tinnitus — Cochrane reviews found no …
Read the guide →Metabolism and weight
Best Blood Sugar Supplements: 8 Formulas Compared on Berberine, Doses and Safety
In blood sugar supplements, the ingredient that matters most is berberine, which has the most consistent human evidence for lowering glucose — and the…
Read the guide →Weight & MetabolismBest Weight Loss Supplements: 8 Formulas Compared on Evidence, Transparency and Safety
In weight loss supplements, what matters most is honest labelling and avoiding harm, because even the better-studied ingredients produce small effects…
Read the guide →Men’s health
Best Men’s Vitality Supplements: 8 Formulas Compared for Blood Flow, Testosterone and Safety
The most useful thing to know about men’s vitality supplements is that “vitality” covers three different goals — blood flow, testosterone and libido —…
Read the guide →Prostate & Men’s Urinary HealthBest Prostate Supplements: 5 Formulas Compared on Beta-Sitosterol, Saw Palmetto and Safety
When comparing prostate supplements, what matters most is that saw palmetto — the best-known ingredient — performed no better than placebo in the most…
Read the guide →Eyes, joints and hair
Best Eye Health Supplements: 4 Formulas Compared Against the AREDS2 Benchmark
For eye health supplements, the benchmark is AREDS2: a large National Eye Institute programme showing that a specific formula of antioxidant vitamins,…
Read the guide →Hair & Scalp HealthBest Hair Health Supplements: What the Evidence Supports and What to Check
For hair health supplements, the most important question is why the hair is thinning, because supplements are only likely to help when a nutritional d…
Read the guide →Joint & Bone HealthBest Joint Supplements: 3 Formulas Compared on Evidence, Transparency and Safety
For joint supplements, what matters most is that evidence is mixed even for the best-known ingredients: glucosamine and chondroitin have inconsistent …
Read the guide →Mouth, skin and nails
Best Dental Health Supplements: 6 Oral Probiotics and Tooth Products Compared
For teeth and gums, what matters most is that nothing replaces brushing with fluoride toothpaste, cleaning between teeth and professional care — so th…
Read the guide →Nail & Foot CareBest Nail Fungus Products: 5 Topical Oils Compared on Evidence and Safety
For nail fungus products, what matters most is knowing that none of the five compared here is established for treating a nail infection: four rely on …
Read the guide →Related
Evidence reviews · Head-to-head comparisons · All supplement reviews · Ingredient guides