Optimum Nutrition
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Everything Vyvata knows about this product — the score, the evidence, the FAQ, and where else to find shopper reviews. No hidden data. Every vendor is scored on the same published rubric — no brand can pay for placement. Read the rubric →
Ceylon Cinnamon Tincture is single-ingredient liquid tincture Ceylon Cinnamon (Cinnamomum verum / zeylanicum). True Ceylon cinnamon (Cinnamomum verum) is distinguished from cassia (C. cassia, C. burmannii) by lower coumarin content and softer bark. Allen 2013 meta-analysis found small fasting glucose and lipid improvements in type 2 diabetes with 120-6000 mg/day cinnamon (cassia in most trials). Effect on HbA1c inconsistent. Ceylon cinnamon specifically has fewer trials but lower hepatotoxicity risk. Ceylon cinnamon is preferred over cassia for long-term daily use due to much lower coumarin content (which can be hepatotoxic at high daily doses). Preliminary RCT signal; not yet a well-established evidence base. Garden Organics is a small US-based single-ingredient herbal line; every product is one botanical in capsule or tincture form (no proprietary blends). Third-party COAs, per-lot heavy-metal/microbial data, and specific standardization percentages are not publicly disclosed at the product level, which is a real transparency gap despite the honest single-ingredient formatting.
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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