Fish oil is one of the most commonly used non-vitamin, non-mineral dietary supplements among American adults1. That's understandable once you realize the benefits of omega-3 fatty acids. The active compounds in omega-3 fish oils have been studied for their role in supporting heart health, brain function, joint comfort, and more.
One common question about omega-3s is when is the best time to take fish oil: morning or night? The answer is more nuanced than you might expect. Find out more below.
Should you take fish oil in the morning or at night
There is no conclusive research that shows the best time to take fish oil. The current evidence doesn't suggest that morning is better than night, or vice versa. What's more important than the timing is consistency and the context in which the supplement is taken, specifically, what foods it's consumed with.
The most important factor: Consistency
If you're wondering, "Should I take fish oil in the morning or at night?" the short answer is that the right time for you is when you actually take it. While some supplements may produce noticeable short-term effects, omega-3s accumulate gradually in the body's tissues over time2.
Whatever you're taking fish oil for, be it for joint support, mood, heart health, or general wellness, you will only reap the rewards if you sustain regular intake. Figure out how fish oil fits best into your routine and stick with it.
Many people find the morning a good time because it fits seamlessly into the wake-up routine of eating breakfast. Plus, breakfast foods like eggs and avocados contain fat, which is important for helping absorption and metabolization—more on that below.
Nighttime supplementation can be trickier because people's dinner habits tend to vary. If you go out for dinner, for example, you may not necessarily remember your supplement. Plus, there's a greater risk that supplementation will be pushed back to right before bed, when the stomach is emptier, which can limit absorption.
Whether you take your fish oil supplements in the morning or at night, prioritize consistency and always take them with food. What you take your supplement with is actually more important than when you take it.
Why food matters more than time of day
Can you take fish oil on an empty stomach? Technically, yes, but it's a bad idea. Omega-3 fatty acids are fat-soluble. This means they need dietary fat for the body to absorb and metabolize them properly. It's been shown that taking an omega-3 concentrate with a fat-containing food increases bioavailability, which refers to the amount of a nutrient the body can actually absorb and use3. Meanwhile, taking omega-3s with a low-fat meal has been shown to reduce absorption4.
The good news is that you don't need an elaborate meal to support good absorption. A moderate amount of healthy fat is sufficient. Foods that pair well with fish oil supplements include eggs, avocado, salmon or other fatty fish, nuts and nut butters, full-fat yogurt, and foods cooked or dressed with olive oil5,6.
If your breakfast tends to be light or low in fat (like oatmeal or fruit), save your fish oil for lunch or dinner when you're more likely to consume the dietary fat needed to promote absorption. If you take fish oil on an empty stomach or alongside a low-fat meal, you won't get the same benefits.
Why OmegaVia
Getting the timing and food right is only part of the equation. The quality of your fish oil supplement matters as well. OmegaVia formulates its supplements in re-esterified triglyceride form, which is better absorbed than the ethyl ester form found in many standard fish oil supplements7. Plus, every batch is IFOS 5-star certified, meaning it's independently tested for purity and freshness.
OmegaVia's formulas target different wellness goals. For example, Ultra Concentrated Omega-3 delivers 1,135 mg of combined EPA and DHA per softgel for broad cardiovascular and joint support. EPA 500 provides pure EPA for mood and joint support, and DHA 600 delivers 600 mg of DHA per softgel for brain, eye, and prenatal support.
Find the formula that fits your needs and then stay consistent to get the maximum benefit.
Frequently asked questions
Is it better to take fish oil in the morning or at night?
There is no conclusive evidence to suggest that there's a best time to take fish oil2. What matters more is consistency and taking your supplement with a fat-containing meal. Since omega-3 fatty acids are fat-soluble, they need dietary fat for the body to absorb and metabolize them4.
How many fish oil capsules should I take per day?
It depends on your goals. A standard 1,000 mg fish oil capsule typically contains only about 300 mg of actual omega-3s1. For general wellness, 500 mg of combined EPA and DHA daily is a reasonable starting point. For more specific goals, like heart or joint support, higher amounts may be appropriate. Ask your doctor for guidance before taking any supplements.
Does taking fish oil before bed help with sleep?
Emerging evidence suggests that omega-3s, especially DHA, may support sleep quality. A randomized controlled trial found that DHA-rich oil reduced the time to fall asleep and EPA-rich oil improved sleep efficiency, both compared to a placebo8.
Can I take fish oil alongside other supplements like vitamin D?
Yes, fish oil and vitamin D are generally safe to take together and may complement each other. Both are fat-soluble, meaning they absorb best when taken with a fat-containing meal. Taking them together at mealtime covers both bases efficiently9. As always, consult your doctor before taking any supplements.
How long does it take for fish oil to start working?
It depends on what you're taking fish oil for. Omega-3s work by gradually accumulating in the body's tissues over time, so results are rarely immediate. Some studies on joint comfort have shown improvements within 12 weeks of consistent supplementation, while other research suggests benefits become more pronounced after six months. The most important thing is to stay consistent and not stop your supplement before it has had a chance to work.
Sources
- (November 2024). Omega-3 Fatty Acids: Fact Sheet for Health Professionals. National Institutes of Health. Retrieved May 22, 2026, from https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/
- Chintapalli, S. (23 March 2026). When Is the Best Time to Take Fish Oil? MedicineNet. Retrieved May 22, 2026, from https://www.medicinenet.com/when_is_the_best_time_to_take_fish_oil/article.htm
- Skulas-Ray, A.C., Wilson, Peter W.F., et al. (19 August 2019). Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory from the American Heart Association. Circulation. Retrieved May 22, 2026, from https://www.ahajournals.org/doi/full/10.1161/CIR.0000000000000709
- Zambon, V. (9 January 2025). What Time of Day is Best to Take Fish Oil? MedicalNewsToday. Retrieved May 22, 2026, from https://www.medicalnewstoday.com/articles/when-to-take-fish-oil
- Berger, K. (18 April 2026). The Best Time to Take Fish Oil Supplements. Verywell Health. Retrieved May 22, 2026, from https://www.verywellhealth.com/time-to-take-fish-oil-8757904
- Zitz, S. (11 September 2025). Taking Fish Oil at This Time Will Deliver the Maximum Benefits, According to Dietitians. Prevention. Retrieved May 22, 2026, from https://www.prevention.com/food-nutrition/a66031175/best-time-to-take-fish-oil-guide/
- Dyerberg, J., Madsen, P., et al. (2010). Bioavailability of Marine N-3 Fatty Acid Formulations. Lipids in Health and Disease. Retrieved May 22, 2026, from https://pubmed.ncbi.nlm.nih.gov/20638827/
- Lozano, A., Kennedy, David O., et al. (16, January 2021). Differential Effects of DHA- and EPA-Rich Oils on Sleep in Healthy Young Adults: A Randomized Controlled Trial. Nutrients. Retrieved May 22, 2026, from https://pmc.ncbi.nlm.nih.gov/articles/PMC7830450/
- Coopermen, T. (29 November 2018). Can You Take Vitamin D and Fish Oil Together? ConsumerLab. Retrieved May 22, 2026, from https://www.consumerlab.com/answers/taking-vitamin-d-and-fish-oil-together/vitamin-d-and-fish-oil/
