Best Vitamins & Supplements: Evidence-Based Guides

Nutricost labels say Manufactured for, not by. We trace the Utah companies behind the brand, the magnesium lawsuits, its FDA record, and the missing COAs.

Doctor’s Best is owned by China’s Kingdomway Group and made by unnamed US contract manufacturers. Ownership, lawsuits, and our 3/10 transparency score.

Costco does not name who makes Kirkland Signature vitamins. We checked labels, USP records, SEC filings, and court dockets to see what can be verified.

Who makes LMNT? SEC filings show contract manufacturing and one dominant owner; the brand posts COAs and faces pending lawsuits. Our verified brand file.

Who makes Life Extension supplements? Labels say made for, not by. We checked the 2017 FDA warning letter, the 1987 raid history, COA policy, and ownership.

NOW Foods is still family owned and makes its products in its own Illinois facility, then tests rival brands. Recalls, lawsuits, and our 9/10 score.

Nature’s Bounty is owned by Nestle Health Science after a 5.75 billion dollar deal in 2021. Who actually makes it, where, plus its recall and lawsuit record.

Sports Research is a family owned San Pedro brand, but its labels say Distributed By, not Manufactured By. Here is who really makes it, and its record.

Thorne makes its own supplements in a 272,000 sq ft Summerville, SC plant, and P&G agreed to buy the brand in August 2026. Ownership and testing, verified.

Nature Made is made by Pharmavite LLC, a California company owned by Japan’s Otsuka Pharmaceutical since 1989. Who runs the plants, and what we verified.