Vitamin E Price Guide: The IU to mg Label Trap

Vitamin E is the only aisle in this series where two bottles can print different milligram numbers, charge different prices, and still contain the same measured amount of the nutrient. The reason is a federal label rule most shoppers have never needed before: vitamin E strength is stated in International Units, and the number of milligrams that one IU represents depends on the form word on the label. The natural form, d-alpha tocopherol, counts as 0.67 mg per IU. The synthetic form, dl-alpha tocopherol, counts as 0.45 mg per IU. That is why a natural 400 IU softgel prints 268 mg while a synthetic 400 IU softgel prints 180 mg — same IU statement, 49 percent more printed milligrams on one label than the other.

This week we pulled every vitamin E listing with a live price on supplement.deals: 331 of them, 82 in counted bottles, 68 of those single-ingredient vitamin E. We read the Supplement Facts panels at the retailers for the rows that carry numbers below, confirmed the conversion factors against the National Institutes of Health conversion tables, and priced every row three ways: per softgel, per 1,000 IU, and per 1,000 label-mg. The IU ruler turns out to be the only number that compares bottles fairly — and it sorts this shelf in ways the sticker price never will.

The two rulers, and why IU wins here

Normalize every bottle to a single number: the cost of one softgel, then the cost of 1,000 IU of labeled vitamin E.

Cost per unit = price ÷ count. Cost per 1,000 IU = price ÷ (count × IU per softgel) × 1,000.

The first ruler is what the sticker shows. The second lets a 60-softgel 200 IU bottle compete with a 110-softgel 400 IU bottle on equal terms. A third ruler, cost per 1,000 label-mg, works only inside one form family — it is the trap ruler, because the same mg weight means different measured amounts in the two form words. Every serving panel we captured says one softgel, so no serving math is needed anywhere in this guide.

The 400 IU shelf: one strength, two labels, two price worlds

The 400 IU shelf is the deepest in the pull: 25 counted single-ingredient bottles. Nine of them carry fully stated label math — six natural-form bottles printing 268 mg and three synthetic-form bottles printing 180 mg.

Read the table with the IU ruler, not the mg ruler: per 1,000 label-mg, the synthetic rows look mid-priced at $0.41 to $0.47 while Bluebonnet looks worst at $1.25. Per 1,000 IU, the real spread inside this one strength runs from $0.185 (the 250-count synthetic) to $0.838 (Bluebonnet) — more than four times between the cheapest and the most expensive 400 IU bottle on the same shelf, all stating the same strength. The mg column cannot explain that spread; the IU column prices it.

The same brand sells both forms, 73 percent apart

The cleanest comparison in the aisle is inside one brand. 21st Century sells the synthetic bottle (180 mg, 110 softgels) for $9.26 and the natural bottle (268 mg, 110 softgels) for $15.99 — identical count, identical stated 400 IU. Per 1,000 IU the natural bottle costs $0.363 against $0.210, a 1.73x premium for the d-alpha word, $22.33 more per year at one softgel a day.

The premium looks smaller once both labels are converted to the same unit. Measured in milligrams of alpha-tocopherol — the conversion NIH publishes — the synthetic 180 mg and natural 268 mg at 400 IU represent 180 mg and 268 mg of alpha-tocopherol respectively, and the per-mg prices are $0.468 versus $0.542: a 1.16x premium. The label premium is real but it is priced on the measured difference, not on it being worth 73 percent more. Both bottles deliver the same 400 IU statement; the word on the label decides how many milligrams carry it.

The 200 IU shelf: half strength, less than half the discount

Six counted single-ingredient 200 IU bottles carry stated label math — two synthetic printing 90 mg, four natural printing 134 mg.

Per 1,000 IU, the 200 IU shelf starts at $0.324 (Swanson) — 60 percent more than the cheapest 400 IU bottle at $0.203. Half strength does not price at half the rate in this aisle: smaller softgel counts and slower bottle turnover push the per-IU rate up. The same pattern holds inside Solgar: its 200 IU natural bottle runs $0.521 per 1,000 IU against $0.412 for its own 400 IU natural bottle, 26 percent more for the smaller strength. If the per-IU price is the ruler, buying 400 IU strength costs less per unit of vitamin E than buying 200 IU — one softgel a day either way on every label we checked.

The 1,000 IU floor: where the bulk math lives

Only three counted single-ingredient 1,000 IU bottles are live, and they are not close to each other.

The Micro Ingredients bottle is the price floor of the entire pull: $0.104 per 1,000 IU, roughly half the cheapest 400 IU bottle and a third of the cheapest 200 IU bottle. Two structural reasons: it is a 240-count bulk bottle (10.4 cents per softgel) and the bulk format is where the per-unit economies stack. Its nearest 1,000 IU rival, the 60-count Horbaech bottle, costs 2.69x more per IU at $0.280 — same strength, same softgel a day, two and a half times the price, purely count economics. Note the Solgar row prints 670 mg at 1,000 IU — 0.67 mg per IU, the natural factor again, consistent across every strength on this shelf.

Count economics: the bottle size beats the brand

Count size moves this aisle more than brand does. The 21st Century synthetic bottle costs 8.4 cents per softgel at 110 counts and 7.4 cents at 250 counts — about 12 percent less per softgel for the identical softgel, in the same brand, at the same stated strength. Across brands the spread is wider: per 1,000 IU, the Vitamin Shoppe natural 400 IU bottle at 60 counts runs $0.666 against $0.203 for the 100-count Mason synthetic — 3.29x for the same strength statement. Swanson 60-count E-200 at $0.324 per 1,000 IU costs 1.60x the Mason 100-count bottle at the same stated strength, purely on count size. The aisle rewards the bigger bottle almost every time we could compare like for like: among 400 IU rows, the two most expensive natural bottles per IU are the 50-count Bluebonnet ($0.838) and the 60-count Vitamin Shoppe ($0.666), while the three 100-plus-count bottles hold the floor.

What the premium shelf sells instead

A few rows price outside the math entirely. Healthy Origins sells a sunflower-sourced 400 IU at $22.44 for 60 counts, $0.935 per 1,000 IU — five times the synthetic bulk floor for a non-soy sourcing story. Life Extension lists the same 400 IU 90-count twice, once as a plain version and once as a Super version, both $21.00, both $0.583 per 1,000 IU — a reminder that identical twins can sit side by side at the same price. The Vitamin Shoppe High Gamma bottle costs $57.62 with no stated strength math on the name at all; it sells a gamma-tocopherol emphasis, not an IU number, and we price it here only to say we checked it. Solaray 50-count 400 IU lands mid-pack at $0.650 per 1,000 IU. None of these carry label math clean enough for the tables above, and none undercuts the floors.

The year at one softgel a day

Every serving panel we captured says one softgel, so the yearly cost is the per-unit cost times 365. At the 400 IU synthetic floor it is $29.57 (Mason, 100 counts) and $30.73 (21st Century, 110 counts); the same brand natural bottle is $53.06, the $22.33 gap from the form word. The natural-form 400 IU floor is $60.15 (Solgar, 50 counts) and the natural-form 400 IU ceiling is $122.35 (Bluebonnet, 50 counts) — double the floor inside one form, one strength, differing only in count size. The 1,000 IU bulk bottle lands at $37.94 a year, between the synthetic and natural 400 IU packs, while the cheapest 200 IU year is $23.66. If the IU statement is what you are buying, the cheap end of this aisle is the synthetic 400 IU 100-count bottle and the 1,000 IU 240-count bulk bottle, at $29.57 and $37.94 respectively for a year of one-a-day.

Where this fits in the series

This is the tenth guide in our per-unit price series, and the method travels: cost per serving sized the creatine shelf in our creatine monohydrate guide, per-gram math settled the mass gainer vs whey question, per-capsule math priced vitamin D3 5000 IU and vitamin B12 1000 mcg, and per-1,000-mg rulers sorted magnesium glycinate, vitamin C, and calcium. Vitamin E adds a wrinkle none of those aisles had: the label number you would naturally compare, milligrams, is the one number that changes meaning bottle to bottle. The full listing set for this aisle, including every bottle in the tables above, lives on our vitamin E deals page — every price here was live and verified on October 17, 2026.