The short answer · Copper status
Take copper sulfate & zinc oxide for copper status. This is the one to buy.
1
21st Century, One Daily, Women's, 100 Tablets
4.7· 35,563 ratings· $0.07/serving
DoseRank score85
Copper Sulfate 1.4 mg — inside the studied 1-3 mg window
Of 3,535 products scored for Copper status, 21st Century, One Daily, Women's, 100 Tablets ranks #1 with a DoseRank score of 85. Copper Sulfate and Zinc Oxide are the strongest evidence signals for this outcome.
The form“Why Copper Sulfate & Zinc Oxide?”Evidence Strong evidence
Copper Sulfate and Zinc Oxide are the strongest evidence signals for this outcome.
- Copper SulfateThe pick
Strong evidence · 1.4 mg
Inorganic copper with high elemental content but poor tolerability; nausea and GI irritation make it less preferred than gluconate or chelated forms.
- Zinc OxideThe pick
Strong evidence · 8 mg
Inorganic zinc salt with high elemental zinc but poor oral bioavailability; cheap and common in topical creams, though chelated forms are preferred for systemic use.
- Zinc Sulfate
Strong evidence · 15 mg
Cheap inorganic zinc with solid elemental content but a higher rate of nausea and stomach upset; common in budget supplements and studies.
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21st Century, One Daily, Women's, 100 Tablets ranks #1 for Copper status with a DoseRank score of 85. The score blends clinical strength, evidence, dose fit, trust signals and value across 3,535 products scored for this outcome.
Copper Sulfate and Zinc Oxide are the strongest evidence signals for this outcome.
1 of 2 dosed ingredients land in the studied range. Copper Sulfate at 1.4 mg lands inside the studied 1-3 mg window. DoseRank scores this product's dose fit at 71 out of 100.
21st Century, One Daily, Women's, 100 Tablets works out at $0.07 per serving. $0.07 per serving — low price tier for this outcome. Nothing else in this ranking costs less per serving.
No. Retailer links may be affiliate links, but rankings and placement are never paid. Every product is scored by the same public model, and the ranking is recomputed from the underlying product data rather than edited by hand.