DeliveredDose

Thorne High Potency Vitamin C, Buffered (42 servings)

C · Claimed
$29.00 at Thorne (direct) · $0.294 per 1,000mg
Free delivery
Buy at Thorne (direct)

Label read Oct 17, 2026. Where the data comes from

Is Thorne third party tested? · Which vitamin C brands are third-party tested?

Cost

$0.294
per 1,000mg vitamin C
$29.00
per container · Thorne (direct)
$8.81
a month at one dose a day
Amount per serving
2,350mg vitamin C
Upper intake level
Adults, 2,000mg a day, from food, beverages and supplements together. One serving of this product holds 2,350mg, more than that level on its own.
An upper intake level is the largest daily intake unlikely to cause harm for most people. It is not a recommendation about what to take.
Servings per container
42
Units needed per dose
0.43 scoops
Doses per container
98.7
Cost per serving
$0.69
  • Printed on this tub's own panel image as "Vitamin C (as Ascorbic Acid) 2.35 g 2,611%" in a "Serving Size: One Scoop (5.7 g)" serving with "Servings Per Container: 42". The comparison basis is milligrams, so 2.35 g is recorded as 2,350 mg (2.35 x 1,000). The panel's three other lines are the minerals of the mineral ascorbates, each printed as an ascorbate: "Calcium (as Ascorbate reacted from Calcium Carbonate and Ascorbic Acid) 350 mg 27%", "Magnesium (as Ascorbate reacted from Magnesium Carbonate and Ascorbic Acid) 350 mg 83%" and "Potassium (as Ascorbate reacted from Potassium Bicarbonate and Ascorbic Acid) 99 mg 2%". The front sells the product as "Buffered for Sensitive Stomachs", and these lines are the buffered form of its vitamin C rather than added actives, so no second active is marked; the amounts are written here so a reader can see them. The front prints "NET WT 8.47 OZ (240 G)", and 42 scoops of 5.7 g is 239.4 g. No other-ingredients line is printed. The side face's GLUTEN FREE mark and the page's "Gluten Free" badge are what the gluten free answer rests on; no vegan or vegetarian claim is made.

Delivery

Delivery cost
Free
This retailer ships free.
Cost per dose delivered
$0.294
Delivery policy: Thorne, Thorne shipping FAQ: "Will there be shipping fees charged on my order?" · checked Aug 31, 2026
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
$29.00
Delivery
Free
Order total, before tax
$29.00
Per 1,000mg vitamin C, delivery included
$0.294

42 labeled servings in this order. Comparison doses are a price yardstick, not advice about how much to take.

Unit price checked Oct 17, 2026.
View this package at Thorne (direct) →

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 policy: Thorne, Thorne shipping FAQ: "Will there be shipping fees charged on my order?" · checked Aug 31, 2026
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

Thorne (direct) · lowest recorded available price
we earn nothing on this link
checked today
$29.00Buy

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: $29.00 at Thorne (direct), checked . First checked on Oct 17.

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 Oct 17, 2026: not listed.
  • Checked USP Verified database on Sep 21, 2026: not listed.
NSF Certified for Sport: checked, not listed
Checked and absent. The Certified for Sport directory as captured on Sep 23, 2026 carries 66 Thorne rows, filed under "Thorne" and "Thorne®", and none is a vitamin C product: no row under either name contains "vitamin c", "ascorb" or "flavonoid". The label on this tub prints NSF's Contents Certified mark, which is a different NSF program and is recorded as the maker's claim on the product, not as a listing here. Absence from a database is not a failed test. NSF's whole directory was read again on Oct 17, 2026, 2,581 listings, and still holds no vitamin C listing under this brand.
Source: NSF Certified for Sport, NSF Certified for Sport directory, full read, October 17, 2026 · checked Oct 17, 2026
USP Verified: checked, not listed
Checked and absent. USP's own Verified Products directory was read page by page in a browser on Sep 21, 2026: 16 pages, 159 products, 16 brands, captured in this site's directory snapshot. This brand does not appear in the directory or in its brand facet, and no product in it names this brand. USP verifies the products a company submits to it, so this records which products were submitted and nothing else. Absence from a database is not a failed test.
Source: USP, USP Verified Products directory, full read, September 21, 2026 · checked Sep 21, 2026
Informed Sport: checked, not listed
Thorne does not appear as a brand in LGC's own Informed Sport product list of October 2026, 497 brands and 1,887 product lines, as read on Oct 3, 2026. Absence from a list is not a failed test: Informed Sport certifies the products a company submits, so this records only that none from this brand is in the program's published list on that date.
Source: LGC (Informed Sport), Informed Sport product list, October 2026 PDF, as read October 3, 2026 · checked Oct 3, 2026
Informed Choice: checked, not listed
Thorne does not appear as a brand in LGC's own Informed Choice product list of October 2026, 201 brands and 853 product lines, as read on Oct 3, 2026. Absence from a list is not a failed test: Informed Choice certifies the products a company submits, so this records only that none from this brand is in the program's published list on that date.
Source: LGC (Informed Choice), Informed Choice product list, October 2026 PDF, as read October 3, 2026 · checked Oct 3, 2026

No test reports located for this product.

Not established: Heavy-metal testing, Label-accuracy testing, Vegan status.
Absence of data is not evidence that a product is clean. It means nobody has published a result we could find.

Label

Form
powder
Serving size
1 scoop
Active ingredient
Vitamin C: 2.35g as labeled
Printed on this tub's own panel image as "Vitamin C (as Ascorbic Acid) 2.35 g 2,611%" in a "Serving Size: One Scoop (5.7 g)" serving with "Servings Per Container: 42". The comparison basis is milligrams, so 2.35 g is recorded as 2,350 mg (2.35 x 1,000). The panel's three other lines are the minerals of the mineral ascorbates, each printed as an ascorbate: "Calcium (as Ascorbate reacted from Calcium Carbonate and Ascorbic Acid) 350 mg 27%", "Magnesium (as Ascorbate reacted from Magnesium Carbonate and Ascorbic Acid) 350 mg 83%" and "Potassium (as Ascorbate reacted from Potassium Bicarbonate and Ascorbic Acid) 99 mg 2%". The front sells the product as "Buffered for Sensitive Stomachs", and these lines are the buffered form of its vitamin C rather than added actives, so no second active is marked; the amounts are written here so a reader can see them. The front prints "NET WT 8.47 OZ (240 G)", and 42 scoops of 5.7 g is 239.4 g. No other-ingredients line is printed. The side face's GLUTEN FREE mark and the page's "Gluten Free" badge are what the gluten free answer rests on; no vegan or vegetarian claim is made.
Vegan
Unknown
Gluten free
Yes
Allergens
Unknown
Other ingredients
Unknown
Label facts rest on: Thorne, Supplement Facts panel and tub faces: Thorne High Potency Vitamin C, 42 servings · checked Oct 17, 2026

Other tracked packages

Same category and format and, for vitamin D, the same labeled strength. Different recorded ingredient-form lists are kept separate. Ordered by container price before delivery; only fresh recorded prices are shown. Formulas, flavors and allergens may differ: check each label. These are browsing options, not recommended substitutes.

Compare every vitamin C we price, per 1,000mg vitamin C →

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.