A complete safety, timing, and dosage guide for combining Evening Primrose Oil (GLA) with Selenium — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take selenium and evening primrose oil (GLA) together safely; they don't interact in any harmful way. Selenium is a mineral, GLA is a fatty acid, and they use separate absorption routes.
Selenium and evening primrose oil together are well-tolerated, with no clinically significant interaction. If you already take selenium and want to add GLA for skin or hormonal support, you can do so without changing your selenium dose. Just be mindful of total nutrient amounts and supplement quality.
Selenium is an essential trace mineral absorbed in the upper small intestine via amino acid transporters, especially when consumed as selenomethionine. Evening primrose oil contains gamma-linolenic acid (GLA), an omega-6 fatty acid that is absorbed into lymphatics as part of chylomicrons after fat digestion. These two nutrients follow entirely different absorption and transport pathways, so they do not compete for receptor sites or enzymes. GLA is metabolized by elongases and desaturases in the liver, while selenium is incorporated into selenoproteins like glutathione peroxidase. No shared cytochrome P450 route exists, so no meaningful metabolic interference occurs.
For most adults, taking selenium and evening primrose oil together at breakfast is a simple routine. Selenium absorbs well with or without food, but a meal reduces nausea, and GLA requires fat for proper absorption. If you prefer to separate them, a two-hour gap works fine, but it's not necessary. Consistency matters more than timing, so choose a time you can stick to daily. If you miss a dose, just resume at your next meal.
Selenium comes as selenomethionine (organic, better absorbed) or sodium selenite (inorganic); this doesn't alter the interaction with GLA. Evening primrose oil is typically standardized to 8–10% GLA, and higher GLA concentrations are not necessary for safety. The only practical form consideration is that EPO capsules should be taken with food to improve fat-soluble absorption.
Evening primrose oil is commonly found in skincare-focused blends alongside selenium, zinc, and vitamin E. Selenium itself appears in many antioxidant multivitamins, though selenium + GLA specific stacks are less common than selenium + vitamin E.
Yes, you can take them at the same time. They use different absorption routes, so there is no competition or interaction. I usually tell my patients to simply take both with a meal.
Yes, it is safe for most healthy adults to take both daily, as long as the selenium dose stays within the tolerable upper limit of 400 mcg per day. I recommend sticking to the labeled effective doses unless your doctor says otherwise.
You don't need to wait at all. I tell my patients they can take them together at the same time or a few minutes apart.
No, they don't compete. Selenium is absorbed as a mineral through amino acid transporter pathways, while GLA is a fatty acid absorbed through the lymphatic system. I can say confidently that they don't interfere with each other's uptake.
People with selenium toxicity or hyperthyroidism should avoid extra selenium, and pregnant women should avoid evening primrose oil, especially in late pregnancy. If you have a bleeding disorder or take anticoagulants, check with your doctor before using GLA.
I recommend taking both with food. Evening primrose oil needs dietary fat for proper absorption, and selenium is better tolerated when not taken on an empty stomach.
Reviewed by Caroline M. on April 26, 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.