A complete safety, timing, and dosage guide for combining Flaxseed Oil (ALA) with Vitamin B9 (Folate, Folic Acid, Methylfolate) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can safely take vitamin B9 (folate, folic acid, methylfolate) and flaxseed oil (ALA) together. They work through different body systems and have no known interactions.
Vitamin B9 (folate, folic acid, methylfolate) and flaxseed oil (ALA) are safe together. Because Vitamin B9 is water-soluble and flaxseed oil is fat-soluble, they follow different absorption pathways in the body and no negative interaction has been reported. You can take them at the same time or at any time that fits your routine.
Folate, folic acid, and methylfolate are all water-soluble forms of vitamin B9. In the jejunum, folic acid is reduced by dihydrofolate reductase and then methylated, while methylfolate can be absorbed via the reduced folate carrier without needing the MTHFR enzyme. Flaxseed oil contains alpha-linolenic acid (ALA), an omega-3 fatty acid that is fat-soluble. After ingestion, ALA is emulsified by bile salts and incorporated into micelles, then absorbed by enterocytes and packaged into chylomicrons that enter the lymphatic system before reaching the bloodstream. These intestinal transport systems are entirely distinct: folate transporters are ion-coupled integral membrane proteins, while lipid absorption depends on micellar solubilization and fatty acid transporters. There is no shared cofactor, common enzyme, or cytochrome P450-mediated pathway that would allow these two compounds to interact. Flaxseed oil does not alter gastric pH or gastrointestinal transit time enough to change folate absorption, and vitamin B9 has no effect on fat digestion or omega-3 metabolism. For these reasons, the two supplements are biologically silent when taken together.
If you need both, the simplest approach is to take them together in the morning with breakfast. A breakfast containing a little healthy fat will help your body absorb the ALA, while the water-soluble folate can be taken with water or juice at the same meal. No spacing is required. If you miss a dose, just take it with your next meal, but do not double up on either supplement. For the most reliable absorption of folate, especially if you have MTHFR variants, choose methylfolate, while for flaxseed oil, keep the bottle refrigerated after opening and respect the expiration date.
The most common forms of vitamin B9 are folic acid, the synthetic form in fortified foods and inexpensive supplements, and methylfolate (L-5-MTHF), the active form that is used directly by the body. If you have a common MTHFR polymorphism, methylfolate may be a more effective choice, but this does not change how it interacts with flaxseed oil. Flaxseed oil is available as liquid oil, softgel capsules, and as ground flaxseed meal, which also contains fiber and lignans. The ALA in softgels is stable and convenient, while liquid oil can be added to salads or yogurt; no matter which form you use, you can still take it alongside your B9 supplement.
These two supplements are frequently paired in plant-based prenatal vitamins, where methylfolate is combined with flaxseed oil as a source of omega-3 fatty acids, and in general heart-health supplements that combine a B-complex with ALA oil.
Yes, you can take them together. They use separate absorption routes and do not compete, so I routinely tell patients there's no reason to separate them.
It is safe to take both daily. I often recommend following the label dose, and if you're using them for a specific health goal, mention it to your doctor.
You don't need to wait at all. I usually suggest taking them at the same meal if it's convenient.
No, they do not compete. Vitamin B9 is water-soluble and absorbed into the bloodstream through the intestine, while ALA in flaxseed oil is fat-soluble and goes through the lymphatic system via chylomicrons, so their pathways are separate.
For most people this combination is safe. However, I would be cautious if you are on blood thinners, and whether you take one or both, high-dose folic acid can mask B12 deficiency, so get your B12 level checked if you have risk factors.
I recommend taking them with a meal. Flaxseed oil is better absorbed when there's some fat in the stomach, and taking vitamin B9 alongside simply makes it easier to remember.
Reviewed by Caroline M. on April 23, 2026 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.