Optimum Nutrition
1
/
of
2
NutraBio L-Arginine Powder
NutraBio L-Arginine Powder
No reviews
No reviews
Regular price
$23.99 USD
Regular price
Sale price
$23.99 USD
Shipping calculated at checkout.
Quantity
Couldn't load pickup availability
The full picture
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 →
66/100
Standard
Six-dimension breakdown
Evidence
58
Formulation
78
Manufacturing
82
Safety
78
Transparency
88
Sustainability
55
Why this scored 66/100
NutraBio L-Arginine Powder is a single-ingredient HPLC-verified L-arginine powder positioned for nitric oxide, growth hormone, and pump effects. The RCT evidence for oral L-arginine is more nuanced than the marketing suggests: while arginine is the direct substrate for nitric oxide synthesis, oral supplementation is limited by low bioavailability (roughly 20% due to hepatic first-pass arginase metabolism), and human studies at doses under 6 g/day often show minimal plasma NO uplift. L-citrulline, which the body converts to arginine downstream of first-pass metabolism, has largely displaced L-arginine as the preferred oral NO precursor because it produces higher and more sustained plasma arginine levels than direct arginine dosing. Growth-hormone-stimulation effects require very high doses (12-15 g) that most users will not take. NutraBio's execution is transparent and clean; the ingredient itself is honestly a Standard-tier choice mostly because citrulline usually outperforms it at similar cost. A defensible pick for anyone with a specific reason to prefer arginine.
Last scored: Full rubric →
Evidence & sources
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.
How to read the Evidence dimension
- 80–100: Multiple double-blind RCTs in indexed journals directly testing this product OR the exact ingredients at the exact dose.
- 60–79: Single double-blind RCT + supporting ingredient literature at the studied dose.
- 40–59: Open-label trials + ingredient literature; no product-specific double-blind evidence.
- 20–39: Ingredient literature only; no product-specific trials or trials in predatory venues.
- 0–19: No credible evidence base or unverifiable claims.
FAQ data has not been generated for this product yet. See the site FAQ for general questions.
Customer reviews
Reviews on other platforms
The Vyvata score measures product integrity against a published rubric, not customer sentiment. Vyvata does not aggregate, republish, or license third-party reviews — the links below open search pages on their respective platforms.
All the data we have on this product
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
- VSF score
- 66 / 100
- Tier
- Standard
- Category
- Supplements
- Subcategory
- cardiovascular heart
- Last scored
- Third-party certifications
- None on record at time of scoring
- Vendor
- Ultimate Sport Nutrition
- Tags
- Shopify Collective, Ultimate Sport Nutrition
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.
Share
