Optimum Nutrition
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NOW Foods (Bloomingdale IL, founded 1968) is a large, well-regarded mid-tier US supplement brand — cGMP-certified manufacturing, one of a small handful of brands ConsumerLab and USP Verified track favorably, transparent about testing, family-owned. This product is 1,000mg vitamin C with rose hips per tablet — straightforward, well-formulated. Rose hips add some natural vitamin C and bioflavonoids. NOW discloses per-lot testing on many products through its testing lab (the largest in-house lab in the industry at ~200 chemists), publishes results, and is transparent about sourcing. 1,000mg vitamin C is at the high end of the tolerable range (2,000mg is the tolerable UL; higher doses cause GI upset in many users). Evidence for vitamin C at 1000mg on immune outcomes is weak in adequately-nourished adults — Hemila 2013 Cochrane found no effect on cold incidence but modest effect on cold duration in regular supplementers. Standard tier — a defensible pick when a user wants supplemental C.
The Vyvata score's Evidence dimension measures the quality of published RCT support for a product's active ingredients at the label dose. Our source hierarchy: double-blind RCTs in MEDLINE-indexed journals > single-blind RCTs > open-label trials > observational studies > mechanism papers > N=1 case studies (anecdotes). Predatory journals and manufacturer-authored studies without independent replication are weighted down.
Product-specific evidence citations for this item are embedded in the analysis text on the "Analysis" tab. For the full framework and evidence hierarchy, see the methodology page.
FAQ data has not been generated for this product yet. See the site FAQ for general questions.
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Every score is set from the published rubric, audit-logged, and rescored whenever new evidence emerges (published trials, updated labels, third-party testing releases). Every vendor is scored on the same criteria — no pay-to-play. See our editorial-independence disclosure for the full policy, including brands with an editorial relationship to this site.

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