Medically reviewed by Lindsay Cook, PharmD<\/p>\n
Why this matters: Taking omega-3 and vitamin D together may improve absorption and offer added health benefits.<\/p>\n
What you can do: Ask your doctor whether taking omega-3 and vitamin D together is right for you.<\/p>\n
The payoff: Combining these supplements may support healthy aging, brain function, and stronger bones.<\/p>\n
Omega-3 and vitamin D are both popular supplements, but they may offer additional benefits when taken together. Because vitamin D is fat-soluble, taking it with omega-3 fatty acids may improve its absorption. Research has explored how combining these supplements could benefit health, though the evidence is mixed.<\/p>\n
1. It Might Slow Biological Aging<\/p>\n
The supplement combo may help lower your biological age, which reflects your health status, compared to your chronological age.<\/p>\n
Studies show that taking about 1 gram of omega-3 per day may slow down biological aging<\/a> by up to four months. A 2025 study found that daily vitamin D supplementation of about 2,000 international units (IU) per day can reduce biological aging, with or without omega-3 fatty acids.<\/p>\n However, researchers have found that taking omega-3 and vitamin D together has even greater benefits for biological aging<\/a>.<\/p>\n 2. Mood Disorders May Improve<\/p>\n Vitamin D helps reduce inflammation in the brain and may help enhance cognition and mood. Omega-3 also supports brain function and can help boost cognition<\/a>. In addition, omega-3\u2019s inflammation-reducing properties may stabilize the nervous system and improve mood.<\/p>\n Taking both vitamin D and omega-3 supplements together may improve depression and anxiety<\/a>. Both supplements work together to ease depression by reducing inflammation and balancing brain chemicals.<\/p>\n However, if you live with depression or anxiety, talk to your healthcare provider, as supplements do not help treat the underlying causes of depression.\u00a0\u00a0<\/p>\n \u200b\u200b3. Your Heart Health May Improve<\/p>\n Vitamin D can reduce the risk of heart attack in patients with heart disease. Omega-3 helps lower triglyceride levels <\/a>and reduce platelets from sticking together, which can help keep you healthy and protect your heart against stroke.<\/p>\n There are mixed results on the heart health benefits of taking both supplements together. Some studies suggest taking both vitamin D and omega-3 together may help reduce the risk of health disease-related deaths in patients with heart attack, stroke, or heart failure. Other studies have not found a significant benefit of taking both supplements together in preventing heart disease.<\/p>\n 4. Your Bones Might Get Stronger<\/p>\n Omega-3 fatty acids may help enhance bone formation and prevent bone from breaking down. Vitamin D helps your body absorb calcium, which can help you maintain strong bones.<\/p>\n Both omega-3 and vitamin D may help reduce the risk of osteoporosis<\/a>. Taking vitamin D and omega-3 fatty acids together may help enhance bone health and reduce fractures.<\/p>\n 5. Your Blood Sugar May Go Down<\/p>\n