From Key Supplements
Thorne Vitamin D-1000 Review: Simple Lower-Dose D3
August 10, 2026
Best for: Someone who wants a lower-dose, single-ingredient vitamin D3 capsule.
Thorne Vitamin D-1,000 supplies 25 mcg (1,000 IU) of vitamin D3 per capsule and comes in a 90-serving bottle. The lower daily dose can be useful for people who do not need a high-strength product, but the product does not have a product-specific independent certification mark listed in our comparison.
What stands out
• 25 mcg (1,000 IU) vitamin D3 per capsule.
• Single-ingredient D3 focus with no lactose or preservatives stated by the brand.
• 90 servings per bottle.
What to consider
A premium brand name does not replace independent testing information. Dose needs vary, and a lower dose is not necessarily the right choice for a diagnosed deficiency. Compare price per serving on the exact current listing.
Verdict
A simple lower-dose D3 option, best for a buyer who already knows that 1,000 IU fits their plan. See the D3 guide and comparison: https://keysupplements.com/best-vitamin-d3-supplements-what-matters-before-you-buy/.
Affiliate disclosure: We may earn a commission from qualifying purchases, which never changes our assessment. Educational content only; not medical advice.