10 Hidden-Gem Supplements No One Markets

A 400 mg/day vitamin that prevents two migraine days a month for pennies. A $4 amino acid that matches NSAIDs for knee osteoarthritis. The flip side of "most overhyped": these supplements don't have marketing departments because they're off-patent. They do have decades of data.

1. Oral rehydration salts — The cheapest perfect-score supplement on Earth. Cents per serving, decades of WHO data.
2. Riboflavin (B2, 400 mg/day) — Cochrane: prevents about 2 migraine days per month. Costs pennies.
3. Melatonin (0.1–0.5 mg micro-dose) — Quietly outperforms the 5–10 mg "knockout" gummies, with no morning grogginess.
4. Sodium bicarbonate (sports) — Possibly the cheapest legal ergogenic in existence. Buffers lactate at 0.3 g/kg pre-event.
5. L-Carnitine — 40 years of cardiac and fertility data. Almost never advertised — it's off-patent.
6. Glycine (3 g pre-bed) — Improves measurable sleep quality. Tastes mildly sweet. Costs almost nothing.
7. Niacinamide (3,000 mg/day) — Matches NSAIDs for knee osteoarthritis. Beats glucosamine head-to-head.
8. Lactoferrin — Raises haemoglobin like ferrous sulphate, with virtually none of the GI upset.
9. Boswellia serrata — Topped a 2025 network meta-analysis of supplements for knee osteoarthritis.
10. Calcium alpha-ketoglutarate (Ca-AKG) — Serum AKG drops 10× from age 30 to 80. Quietly one of the most interesting longevity compounds.

Bottom line

Price tracks marketing budget, not evidence. Seven of the ten supplements above cost less than $6 a month and have strong human data. The reason you haven't heard of them is the same reason they're affordable.

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