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Vitamin D-1000 (90 capsules)

Thorne Vitamin D-1,000 provides 1,000 IU (25 mcg) of vitamin D3 as cholecalciferol — the same form your skin produces in sunlight, and the form most efficiently converted to active vitamin D in the body. Each capsule also contains a small amount of vitamin E as a natural antioxidant to help protect cells from oxidative stress and preserve the formula's stability. Vitamin D is one of the most commonly identified nutritional shortfalls in the UK, particularly between October and March when UVB exposure is too low for the body to produce its own. Even during summer months, those who work indoors, wear sunscreen consistently, or have darker skin tones are at higher risk of insufficiency. A blood test measuring 25-hydroxyvitamin D is the only reliable way to know where you stand — supplementing without one means guessing.

At 1,000 IU per capsule, this is a sensible maintenance dose for adults whose levels are already within normal range and who want to stay there. Those correcting a confirmed insufficiency may need a higher daily intake under clinical guidance — the capsule format makes it straightforward to adjust the number taken per day based on your results and your practitioner's recommendation.

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How to use

Take 1 capsule daily with a meal containing some fat, or as directed by your healthcare professional. Vitamin D is fat-soluble, so absorption improves when taken alongside dietary fat — even a small amount is sufficient. Those supplementing at higher doses (2–3 capsules daily) should do so under clinical guidance, ideally with periodic blood monitoring to track 25-hydroxyvitamin D levels and avoid over-supplementation. Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

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