Optimum Nutrition
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Citrulline-arginine Capsules
Citrulline-arginine Capsules
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Regular price
$21.72 USD
Regular price
Sale price
$21.72 USD
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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 →
58/100
Standard
Six-dimension breakdown
Evidence
14
Formulation
12
Manufacturing
12
Safety
9
Transparency
7
Sustainability
5
Why this scored 58/100
L-citrulline and L-arginine are both nitric-oxide (NO) precursors used in sports supplementation for vasodilation ('pump'), endurance, and mild blood-pressure effects. L-citrulline has better oral bioavailability than L-arginine (arginine is degraded by intestinal arginase; citrulline is not, and is then converted to arginine in the kidneys, producing higher and more sustained plasma arginine than direct arginine supplementation — Schwedhelm 2008). Effective doses: L-citrulline 6-8g/day (as citrulline malate 8-10g), or L-arginine 3-6g/day. Combined citrulline+arginine is redundant biologically (citrulline becomes arginine), but marketing-common. This SKU discloses no per-capsule mg for either ingredient. Standard 58/100: real ingredients with real evidence for their claimed uses, held down by undisclosed doses.
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
- 58 / 100
- Tier
- Standard
- Category
- Supplements
- Subcategory
- protein amino acids
- Last scored
- Third-party certifications
- None on record at time of scoring
- Vendor
- Vivalo
- Product type
- 0
- Tags
- Shopify Collective, Vivalo
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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