Colostrum & organ supplements

These are foods in a capsule or scoop, so the label and the batch reports matter most. Testing carries 35%: heavy metals and germs per batch, plus vitamin A and PFAS for liver, because liver is high in vitamin A and Prop 65 notices allege PFAS or lead in several liver supplements. For colostrum we look for the IgG on the label and first-milking collection: a 2020 lab study (opens in a new tab) found six-fold differences in activity across 20 products. See our colostrum and liver guides.

Ingredients 25%

The food and its capsule, nothing else: no fillers, flow agents or added vitamins.

Independent testing 35%

Heavy metals and pathogens tested per batch, and for liver the vitamin A per serving, with results published.

Sourcing 20%

Grass-fed and pasture-raised animals from a named country, ideally certified.

Trust 10%

Highest when the maker names everything, answers questions, and has no recalls, warning letters, Prop 65 notices or lawsuits over safety or labeling. Points come off for unresolved problems and for paid promoters it does not disclose.

Value 10%

Price per day’s dose against the others here that pass.

Each product scores every one from 1 to 5, and its rating is the weighted average. We list only products rated 3 or above that break none of our rules.

We avoid

• Liver products that do not state vitamin A, which can exceed safe limits, especially in pregnancy.
• Colostrum or organ “blends” with no amount per ingredient.
• Colostrum sold as a processed concentrate while citing trials of whole colostrum.
• Immune, gut-healing or hormone claims that go beyond the human trials.

Read the research

• Gut Health, Immunity, and Athletic Recovery
• Beef Liver: Nature's Most Nutrient-Dense Food
• Nature's Multivitamin
• Retinol, Immunity, and Skin Renewal
• How to Tell if a Supplement Is Pure and Accurate