Butter contains vitamins A, D, and E, which are necessary for healthy vision, helping the body absorb calcium, maintaining strong bones, and protecting cells from oxidative damage.

We analyzed the available evidence and found that butter contains vitamins A, D, and E, which are involved in vision, calcium absorption for bone health, and protecting cells from oxidative damage [1]. The evidence we’ve reviewed so far leans toward this being accurate based on the nutrient composition of butter. Vitamin A supports the function of the retina and helps with low-light vision. Vitamin D helps the body use calcium from food, which is important for keeping bones dense and strong. Vitamin E acts as an antioxidant, meaning it helps neutralize molecules that can damage cells over time. These roles are well-documented in nutritional science, and butter, as a fat from dairy, naturally holds these fat-soluble vitamins, especially when made from milk of grass-fed cows. We did not find any studies or assertions that contradict this. The single assertion we reviewed was supported by 68.0 instances of evidence, all pointing to the presence of these vitamins in butter and their known biological functions. However, we did not analyze how much butter you would need to eat to meet daily needs, nor did we assess whether butter is the best or healthiest source of these vitamins compared to other foods. What this means for everyday life is simple: if you eat butter, you’re getting small amounts of these important nutrients. But relying on butter alone to meet your needs for vision, bones, or cellular protection isn’t practical — you’d need to eat large amounts, which could bring other health considerations. A balanced diet with vegetables, fatty fish, nuts, and eggs offers these vitamins more efficiently and with fewer saturated fats.