Vaccenic Acid — The Ruminant Trans Fat

Trans-vaccenic acid (TVA) is a naturally occurring trans fatty acid found primarily in ruminant-derived foods. It has been shown to directly promote effector CD8+ T cell function and enhance anti-tumour immunity in vivo by reprogramming T cell metabolism. Additionally, TVA can be endogenously converted to conjugated linoleic acid (CLA), which modulates lipid metabolism and inflammatory pathways. In preclinical models, vaccenic acid has also demonstrated the ability to suppress intestinal inflammation by increasing levels of anandamide and related N-acylethanolamines.

No published human longevity trials. Animal/in-vitro evidence only. While observational studies have examined the relationship between dairy fat consumption and cardiometabolic health, specific interventional trials isolating vaccenic acid for longevity or immune enhancement in humans are lacking.

Unestablished in humans for longevity or anti-tumour purposes. In clinical and dietary studies, vaccenic acid is typically consumed as part of ruminant fat (dairy and beef) rather than as an isolated supplement. Preclinical studies have used doses equivalent to roughly 500 mg/kg in mice, but no standard human dosing protocol exists.

As a naturally occurring trans fat, vaccenic acid behaves differently from industrially produced trans fats, but high intake of ruminant fats carries general cardiovascular considerations. Long-term safety of isolated high-dose supplementation is unknown. Individuals with dyslipidemia or cardiovascular disease should consult a physician before significantly increasing intake of ruminant-derived fats.

Key Papers