Optimum Nutrition
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Aziza & Fae is a small US-based health and wellness brand, and this SKU is a single-ingredient L-arginine capsule. L-arginine is a semi-essential amino acid and the substrate for endothelial nitric oxide synthase — plausible mechanism for improved vasodilation. Human RCT evidence is mixed: some cardiovascular trials show modest blood-pressure reduction at doses of 6-9 g/day (Dong 2011 meta-analysis), some erectile-dysfunction trials show mild benefit at 3-6 g/day, and post-VISP trial concerns (Schulman 2006) noted increased mortality in post-MI patients supplemented with L-arginine — meaning cardiovascular disease patients should be cautious. Per-capsule dose is not clearly disclosed in the metadata excerpt; if the product delivers 500-1000 mg per capsule with a 1-2 capsule daily serving, that is below the studied cardiovascular range (6-9 g/day) but consistent with general-wellness supplementation. Standard-tier entry pending disclosed dose confirmation.
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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