Double Wood Supplements Marine Collagen Powder, Unflavored (38 servings)
Label read Sep 19, 2026. Where the data comes from
Which collagen brands are third-party tested?
Cost
- Grams of collagen per serving as printed in the ingredient line of the panel (src above): "Collagen peptides (from whitefish) 12g" in a "12g (Approx 1 Scoop)" serving, 38 servings per container. The panel prints no Protein line at all, so the collagen line is the only figure the price rests on. Net weight is deliberately not recorded: the container is powder, the basis is the collagen peptides in it, and the two must not be divided into each other.
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
- $29.95
- Delivery
- Unknown
- At least, before delivery & tax
- $29.95
- Per 10g collagen peptides, before delivery
- $0.657
38 labeled servings in this order. Comparison doses are a price yardstick, not advice about how much to take.
Delivery is extra; the retailer has not published a rate we can apply.
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 shipping on orders over $30, from the shipping policy page, first read September 1, 2026: "We currently offer the following shipping methods: Free Shipping for orders over $30, Standard Shipping for orders under $30". The page read "Free Shipping for orders over $30" again on September 26, 2026. The standard rate itself is not published, so delivered cost below $30 is Unknown.
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: $29.95 at Double Wood Supplements (direct), checked . Unchanged since we started checking on Sep 20 (28 checks).
- Out of stock recorded Sep 30; back in stock recorded Oct 1.
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.
- The testing claim we recorded for this product, with where it appeared: "Third-Party Tested" (mark printed on the label image, naming no program). With no program named there is no listing to open against it, so it does not raise the verification level.
- Checked NSF Certified for Sport database on Sep 19, 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.