How the product index is sourced and scored

We aggregate already-published product specifications and do not operate a laboratory.

Provenance tiers

• Third-party COA: measured by an identifiable independent laboratory.
• Brand COA: documented by the brand without independently identifiable testing.
• Brand-claimed: stated without a linked COA.
• Retailer listing: taken from a marketplace and not corroborated.

Beta-glucan and value

Measured data and brand claims are not equivalent. Missing values stay Not disclosed.

price per gram of beta-glucan = priceUsd / (servingsPerContainer × servingSizeMg / 1000 × betaGlucanPct / 100).

Guardrails

• No invented specs.
• No written reviews.
• Compensation does not change product data, provenance, transparency tier, or ordering.

Open data downloads and field dictionary