We test with data, not vibes. How we rank · As an Amazon Associate we earn from qualifying purchases.
BLBasketLab
Vitamins & Supplements

Iron

Iron is a supplement to take when you need it, not by default. Low iron is genuinely common, especially for women and people who eat little red meat, and it can leave you wiped out. But iron is also easy to overdo, and too much isn't good for you, so this is one to base on a blood test or a GP's nod rather than a hunch. Gentle and slow-release formulas are popular because standard iron can upset the stomach.

Short answer

On the ratings data the strongest iron we track is Solgar Gentle Iron 20 mg Vegan Capsules, on 4.6 out of 5 from 10,300 ratings. If you want to spend less, Vitabiotics Ultra Iron Tablets Supplement, Boosts Energy, Vitality sits at the cheaper end and still rates at or above the middle of the shelf. Neither is a paid placement, and the full working is below.

How the iron shelf is spread on rating and priceOf the 48 rated iron products we track, 15 sit 4.6 and up, 29 sit 4.3 to 4.5, 4 sit 4.0 to 4.2, 0 sit below 4.0. Prices run from £3.64 to £30, with the midpoint around £9.94.What this shelf actually looks like (48 rated products)4.6 and up154.3 to 4.5294.0 to 4.24below 4.00Price range on this shelflow to high£3.64midpoint £9.94£30
Worked out from the 48 rated iron products we track, not from brand claims. Price positions come from our last catalogue refresh (20 September 2026); the price shown on each product is fetched live.

Common questions

Should I take iron just because I am tired?

Not without checking. Tiredness has many causes, and taking iron you don't need can do harm. A simple blood test tells you whether you're actually low, which is the right basis for supplementing.

Why does iron upset my stomach?

Standard ferrous sulphate is notorious for constipation and nausea. Gentler forms like bisglycinate, or taking it with food or every other day, often help a lot.