NutraBio Muscle Matrix - 2 lb

Six-dimension breakdown

Why this scored 74/100

NutraBio Muscle Matrix is a 55/45 whey-isolate-plus-micellar-casein blend delivered at approximately 25 g protein per serving in the 2 lb tub. The fast/slow-digesting protein-blend concept is one of the better-studied sports-nutrition strategies: whey isolate spikes plasma leucine and drives acute muscle protein synthesis, while micellar casein forms a slow-releasing gastric coagulum that extends aminoacidemia for six to eight hours, which is the mechanism the label references. NutraBio publishes a full, non-proprietary Supplement Facts panel, discloses each protein source separately, and third-party tests every lot for identity, potency, heavy metals, and microbial contamination — a level of transparency that puts them in the top decile of sports-nutrition brands. The formula includes no amino spiking, no dextrose or maltodextrin filler, and the label lists ingredients honestly. The main deductions are on sustainability (no disclosed grass-fed sourcing, no carbon-footprint reporting, plastic tub packaging) and on evidence-tier boost (protein-blend RCTs are numerous but effect sizes over whey-alone are modest). A defensible Verified pick for anyone wanting a nighttime or between-meals protein rather than post-workout only.

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

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

74 / 100

Tier

Verified

Category

Supplements

Subcategory

protein amino acids

Last scored

August 29, 2026

Third-party certifications

None on record at time of scoring

Vendor

Ultimate Sport Nutrition

Product type

Protein Powder

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.