Pentadecanoic acid • C15:0
How much do you need to eat?
C15:0 rides inside dairy fat and grass-fed ruminant fat. Add servings below to estimate your daily intake against the research target of 200 mg (the range studied is 100–300 mg).
Read the numbers as estimates. C15:0 content swings widely with the animal's diet, so these are midpoints of published ranges, not lab values. Grass-fed dairy and ruminant meat run meaningfully higher than grain-fed — that's what the toggle reflects. Fish is included but notoriously variable, so treat it as a bonus, not a plan.
Hitting 200 mg through food also means a fair amount of saturated fat and full-fat dairy, which is a personal tradeoff. The single easiest change is swapping low-fat dairy for full-fat, since C15:0 lives in the fat that gets removed.
This tool is for general education, not medical or dietary advice.
How strong is the evidence?
- C15:0 is a reliable biomarker of dairy-fat intake.
- Higher circulating C15:0 correlates with lower rates of type 2 diabetes, cardiovascular disease, and fatty liver in large observational studies.
- The ingredient is GRAS and considered safe at studied doses.
- Causal benefit from supplementing purified C15:0. Human trials are small; independent analyses find association without established causality.
- High C15:0 may be a marker of a full-fat-dairy diet rather than the active agent.
- "Third essential fatty acid," "Cellular Fragility Syndrome," and longevity / metformin-mimic framing — largely from company-affiliated research (Seraphina / fatty15), not independently established.