Thorne Vitamin D + K2 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 Vitamin D3) (1,000 IU) 25 mcg 125%". The label states the IU figure itself, and the arithmetic agrees: 1 mcg = 40 IU, so 25 x 40 = 1000 IU, which the panel writes as 1,000 IU. The serving is the panel's own "Two Drops". Servings per container is the panel's "Servings Per Container: 600"; the product page's ingredient block prints "Servings Per Container: 1200" and its price block prints "/1200 Drop(s)", which is the same bottle counted in drops, since 600 two-drop servings is 1,200 drops. The panel figure is the one recorded, and both are written down in the label source. The front face prints "1 FL. OZ. (30 mL)", a volume, so no net weight is recorded.
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
- $34.00
- Delivery
- Free
- Order total, before tax
- $34.00
- Per 1,000 IU vitamin D3, delivery included
- $0.057
600 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: $34.00 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 C: Claimed, not confirmed
Two different things reach this level, and the product page says which. Either the label or the product page names an independent third-party program, such as NSF Certified for Sport, NSF Contents Certified or Informed Sport, and we have not confirmed a listing for this package in that program’s own database; or the only test results available are ones the manufacturer or a lab it commissioned published, which may well be accurate and is simply not independent. A mark printed on a package is not the same thing as a listing anyone can open, and that gap is what this level records. It is not a finding against the product.
- The testing claim we recorded for this product, with where it appeared: NSF Contents Certified mark printed on the label's side face. That is NSF's contents certification, a different program from NSF Certified for Sport, and the page makes no Certified for Sport claim for this package. We found no published result to check it against.
- 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.