Thorne Vitamin D3 Liquid (1 fl oz)
Label read Sep 20, 2026. Where the data comes from
Is Thorne vitamin D NSF certified? · Is Thorne third party tested? · Which vitamin D3 brands are third-party tested?
Cost
- Printed on this bottle's own panel as "Vitamin D (as Cholecalciferol) (D3) 100 mcg (4,000 IU) 500%". The label states the IU figure itself, and the arithmetic agrees: 1 mcg = 40 IU, so 100 x 40 = 4000 IU, which the panel writes as 4,000 IU. The serving is the panel's own "One Dropperful (1 mL)", and its "Servings Per Container: About 30" is recorded as 30. The front face prints "1 FL OZ (30 mL)", a volume, so no net weight is recorded. The page's own ingredient block prints the 100 mcg figure and no IU figure; the IU here is the panel's.
Delivery
Buying more than one? Calculate the order
Change the quantity to see the actual container subtotal and whether it reaches the recorded free-delivery threshold.
- Container subtotal
- $24.00
- Delivery
- Free
- Order total, before tax
- $24.00
- Per 1,000 IU vitamin D3, delivery included
- $0.20
30 labeled servings in this order. Comparison doses are a price yardstick, not advice about how much to take.
Set the quantity at the retailer; this calculator does not add items to a cart. Uses the recorded unit price with no coupon or quantity discount. Tax is extra. Delivery terms apply to the contiguous US unless the policy says otherwise.
Delivery terms and limits
Free Ground shipping on all retail orders within the contiguous United States, with no minimum order value, from Thorne's shipping FAQ, first read August 31, 2026 and read again on September 18, 2026 with the same terms. Alaska and Hawaii are excluded: free above $300, otherwise a variable fee with a $30 minimum. Wholesale terms differ ($200 minimum, $11.95 below it) and are not what this site prices. With no threshold to clear, delivered cost within the contiguous US equals the price at any cart size.
Where to buy
Ordered by price, lowest first, and labeled so you can see what each link earns us. Commission is never an input to that ordering. If the cheapest retailer pays us nothing, that is still the one we send you to. No link on this page earns us anything; every Buy button is a plain retailer link.
Price history
Latest recorded price: $24.00 at Thorne (direct), checked . Unchanged since we started checking on Sep 20 (27 checks).
We check each price about once a day, so this is the range we recorded, not necessarily every price there has been. It says what changed, not why, and nothing about where the price goes next.
Verification, Tier D: Could not locate independent data
We could not locate independent testing or certification for this product. That is a statement about our search, not about the product. These programs certify what a company submits to them, so a product can be absent simply because it was never entered, which is not a finding against it. Which certifier databases we searched, and when, is listed below. Where a program is not listed there, we have not checked it and do not imply anything either way.
- Searched 4 certifier databases and found no listing for this product, and located no published test results. Programs we did not search are named below as not checked.
- Checked NSF Certified for Sport database on Sep 20, 2026: not listed.
- Checked USP Verified database on Sep 21, 2026: not listed.
No test reports located for this product.
Label
What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.