Who writes and reviews it

NutriDex is curated and medically reviewed by Dr Daryl Peh (MBBS Singapore, MMed Family Medicine), a licensed medical practitioner practising in Singapore. Every entry is written and graded by a clinician, not generated unattended — the goal is a reference a doctor would be comfortable standing behind.

What’s inside

431 substances across 20 categories, each carrying a transparent evidence tier (strong / moderate / preliminary / mixed / no-evidence / banned), purported benefits, typical dosing, safety cautions, and links to 4,736+ cited human studies (4,730 verified straight to the source). The catalogue deliberately includes the substances with no good evidence and those that are banned or harmful — knowing what doesn’t work, or what to avoid, matters as much as knowing what does.

How evidence is graded

Tiers reflect the weight and consistency of published human research — meta-analyses and RCTs carry more weight than small or preclinical studies — and may change as new evidence appears. The full grading approach is on the methodology page. Entries are refreshed on a weekly cycle that pulls in recent high-quality studies.

Our promise to you

• Free and non-commercial. Nothing for sale, no sponsored entries, no affiliate links.
• Cited, not asserted. Claims link to the underlying human studies so you can check them yourself.
• Educational, not medical advice. NutriDex describes the evidence at a population level; it can’t account for your individual health. Always talk to your own doctor or pharmacist before starting, stopping, or combining supplements or medicines.

Corrections & contact

Found an error, an outdated study, or a citation that doesn’t check out? Corrections from readers and clinicians are welcome and are reviewed by Dr Daryl Peh. A public contact address is being set up — check back shortly.