A complete safety, timing, and dosage guide for combining Evening Primrose Oil (GLA) with Ginkgo Biloba — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take Ginkgo Biloba and Evening Primrose Oil together — there is no known interaction, and combining them is generally safe for most healthy adults.
Ginkgo Biloba and Evening Primrose Oil together are safe to combine. No clinically significant interaction exists between the two, so adding evening primrose oil to a ginkgo routine is fine for most people. Both supplements work through separate pathways, and neither interferes with the other's absorption or metabolism.
Ginkgo biloba contains ginkgolides and bilobalide—terpene lactones that inhibit platelet-activating factor and support cerebral circulation. Evening primrose oil provides gamma-linolenic acid (GLA), an omega-6 fatty acid that gets elongated to dihomo-GLA and then converted to series-1 prostaglandins, which have anti-inflammatory effects. These molecular pathways are entirely distinct and do not share receptors, enzymes, or transport proteins. Ginkgo's flavonoid glycosides are metabolized via phase II conjugation (glucuronidation/sulfation), while GLA is incorporated into phospholipid membranes and oxidized through beta-oxidation. There is no evidence that either supplement changes the other's solubility, protein binding, or cytochrome P450 clearance in a meaningful way.
If you need both, take them together once or twice daily with a balanced meal containing some fat—breakfast or lunch works well. There is no need to space them apart; a 30-minute gap is irrelevant. Start with the lowest effective dose: 120 mg of standardized ginkgo extract and 500 mg of evening primrose oil, then gradually increase the EPO to 1,000 mg if your practitioner agrees. If you miss a dose, just take the next scheduled dose at the usual time, and if you are on anticoagulants, keep your healthcare provider informed about your supplement routine.
Ginkgo biloba extracts are typically standardized to 24% flavone glycosides and 6% terpene lactones—choose a product with that label for consistent dosing. Evening primrose oil is usually standardized to 8–10% GLA; a higher GLA percentage per capsule means you can take fewer pills. The interaction profile does not change between capsules, softgels, or tinctures, but enteric-coated or emulsion-based EPO can reduce stomach upset in sensitive individuals.
Yes, you can take them together—I find that taking them with a meal is easiest. They don't interfere with each other's absorption, and you won't double the risk of side effects.
Yes, daily use is safe for most healthy adults. I recommend taking a consistent dose at the same time each day and watching for unusual bruising or bleeding, especially if you're on other medications.
There's no need to wait—I suggest taking them together with a meal. If you prefer to space them, 30 minutes apart is plenty, but it's not necessary.
No, they don't compete. Ginkgo's flavonoids are absorbed through intestinal transporters, while GLA is a fatty acid that gets incorporated into chylomicrons. They take different routes, so coadministration doesn't reduce either's effectiveness.
Most people can take them, but if you're on blood thinners, have a bleeding disorder, or are pregnant (especially with ginkgo), check with your doctor first. For surgery, stop these two weeks ahead.
Take them with food—a meal that includes some fat helps absorption, especially for evening primrose oil. Ginkgo is fine either way, but food can reduce stomach irritation.
Reviewed by Caroline M. on April 27, 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.