Best Copper Supplements 2026: Cost per Effective Dose
Top pick for Copper: NOW Foods Copper Glycinate 3mg — 3mg elemental copper per 1 tablet, cGMP, $0.07/day. Our best-value pick.
Registry check · Copper
Does anyone independently verify Copper supplements?
1 of these 6 products are confirmed in NSF/ANSI 173, which puts this category in the minority with any verified option at all. The other 5 are not listed anywhere we can check — not evidence against them, only an absence of independent confirmation.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the Copper dose column either way.
6 checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What 6 Copper labels show
Priced per day, these copper products run $0.06 to $0.32 — a 5.3× gap between the cheapest and dearest copper here, across 6 brands.
Servings here are close enough to compare directly, so the gap is a real one: Bronson at $0.06 buys the same thing as Thorne at $0.32.
All Copper Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Bronson Copper Glycinate 3mg | Bronson | 3mg elemental copper / 1 tablet | $0.06 | None stated | Buy | |
| NOW Foods Copper Glycinate 3mg | NOW Foods | 3mg elemental copper / 1 tablet | $0.07 | cGMP | Best Value | Buy |
| Solgar Chelated Copper 2mg | Solgar | 2mg elemental copper / 1 tablet | $0.08 | None stated | Buy | |
| Dr. Mercola Copper Bisglycinate 2mg | Dr. Mercola | 2mg elemental copper / 1 mini-tablet | $0.11 | None stated | Buy | |
| Pure Encapsulations Copper Glycinate 2mg | Pure Encapsulations | 2mg elemental copper / 1 capsule | $0.22 | NSF-audited GMP, hypoallergenic | Buy | |
| Thorne Copper Bisglycinate 2mg | Thorne | 2mg elemental copper / 1 capsule | $0.32 | TRAACS-chelate (Thorne-stated); no independent COA verified for this build | Buy |
In-Depth Copper Guides
Go deeper on copper — by goal, by form, and what the evidence actually supports:
Our Picks
Best Value: NOW Foods Copper Glycinate 3mg
3mg elemental copper per 1 tablet. cGMP. $0.07/day. 120 servings per container at $7.95.
The shelf · Copper
The Copper shelf is unusually consistent
Across 6 products from 6brands, the cheapest day is Bronson Copper Glycinate 3mg at 6¢ and the dearest Thorne Copper Bisglycinate 2mg at 32¢ — a gap of 5.3×, where categories on this site routinely run 15× or worse. With Copper priced this tightly, the 6-brand question of who will verify their contents decides more than the price column does.
Method: the 6 Copper products above, compared on label facts — serving size, servings per container, form, price. Not a dosing recommendation.
The evidence · Copper
What the published reviews of Copper concluded
- Zinc and copper supplementation are not cost-effective interventions in the treatment of acute diarrhea. · Journal of clinical epidemiology, 2013
“This study showed that zinc or zinc with copper supplementation were not cost-effective in the treatment of acute diarrhea in this study population.”
Method: PubMed searched in humans for randomised trials with Copper in the title; these 1 of the 1 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Copper will work for you — each of these reports an average across trials, and null findings are shown here as readily as positive ones.
How these 6 Copper products were ranked
1 of these 6 are confirmed in a certifier's registry — the only copper rows where the claim is independently backed — and the rest are ranked on cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever copper you buy. Full methodology.