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60/100
Standard
Six-dimension breakdown
Evidence
65
Formulation
60
Manufacturing
58
Safety
68
Transparency
55
Sustainability
52
Why this scored 60/100
L-carnitine powder — evidence base varies by form + use case. L-carnitine tartrate for exercise recovery (Volek 2002, Kraemer 2003), acetyl-L-carnitine for cognitive/neuroprotective (Malaguarnera 2011). Regular L-carnitine oral absorption is poor (10-20% bioavailability); GPLC (glycine propionyl L-carnitine) and acetyl form have better profiles for specific uses. Held to Standard by lack of form-specification (tartrate vs acetyl vs GPLC vs plain).
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.
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
VSF score
60 / 100
Tier
Standard
Category
Supplements
Subcategory
energy metabolic
Last scored
Third-party certifications
None on record at time of scoring
Vendor
Bulkessentials
Tags
Bulkessentials, Shopify Collective
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.
