Valupak Evening Primrose Oil

Evening primrose oil is one of the most popular botanical supplements in the UK, taken by many adults as a daily source of gamma-linolenic acid (GLA), a naturally occurring omega-6 fatty acid. Valupak Evening Primrose Oil is available in 500 mg and 1000 mg capsules, providing a convenient way to include GLA in your daily supplement routine. GLA is an essential fatty acid that the body converts to compounds involved in a range of physiological processes. Evening primrose oil is a rich natural source of GLA and is widely taken to support skin health and general nutrient support. Available without a prescription, Valupak Evening Primrose Oil suits adults looking for a straightforward daily fatty acid supplement.

Valupak Evening Primrose Oil capsules contain cold pressed oil from the seeds of the evening primrose plant (Oenothera biennis), a flowering plant native to North America. Evening primrose seed oil is one of the richest plant sources of gamma-linolenic acid (GLA), a long chain omega-6 polyunsaturated fatty acid. Most vegetable oils are high in linoleic acid (LA), but evening primrose oil is notable for its high GLA content, typically providing around 8 to 10 percent of its total fatty acid content as GLA.

GLA is classified as a conditionally essential fatty acid. The body can produce GLA from linoleic acid through the action of the enzyme delta-6-desaturase, but this conversion can be inefficient in some people, particularly in older adults, those under stress, and those with diets high in processed fats. Evening primrose oil provides GLA directly, bypassing this conversion step.

Each 1000 mg capsule typically provides approximately 80 to 100 mg of GLA. Each 500 mg capsule typically provides approximately 40 to 50 mg of GLA. Always check the product label for the exact GLA content per capsule.

Evening primrose oil is taken by many adults as a daily supplement, particularly women who are interested in its research associations with skin health and female wellbeing. It is also taken as a source of omega-6 fatty acids as part of a varied supplement routine alongside other nutrients.

Evening primrose oil works through the fatty acid content of the oil, particularly its gamma-linolenic acid (GLA) content.

GLA and Prostaglandin Synthesis

After absorption, GLA is converted in the body to dihomo-gamma-linolenic acid (DGLA), which is then used in the synthesis of series-1 prostaglandins and certain other eicosanoids. These compounds are involved in a range of regulatory processes in the body including inflammatory responses, blood vessel function, and cell membrane integrity. The theory underlying many of the research uses of evening primrose oil is that increasing GLA availability may influence these prostaglandin pathways.

Skin Health and GLA

One of the most studied potential applications of evening primrose oil is in skin health. GLA is a component of the skin barrier lipids that help maintain moisture retention and skin integrity. Some research has investigated evening primrose oil in relation to skin dryness, eczema, and skin barrier function. While the evidence for specific skin conditions is mixed and no authorised health claim has been established for evening primrose oil and skin health in the UK, GLA as a fatty acid contributes to the structural components of healthy skin membranes as part of adequate fatty acid nutrition.

Research into Hormonal and Menstrual Wellbeing

Evening primrose oil has been widely studied in relation to premenstrual symptoms and menopausal wellbeing. The proposed mechanism involves the role of GLA derived prostaglandins in female hormonal physiology. However, clinical trial evidence in these areas has been inconsistent, and the European Food Safety Authority has not authorised health claims for evening primrose oil in relation to premenstrual symptoms, hormonal balance, or menopause. Evening primrose oil is not a medicine for these conditions and cannot be described as a treatment for PMS or menopausal symptoms. If you experience significant premenstrual or menopausal symptoms, speak to your GP for appropriate support and management.

Always follow the dosage instructions on the product label. The following guidance reflects standard recommendations for evening primrose oil supplements.

• Take one to two capsules daily, as directed on the product label or as advised by your pharmacist.
• Evening primrose oil capsules can be taken with or without food.
• Swallow the capsule whole with a glass of water.
• Take consistently each day as part of your routine. Many people who take evening primrose oil do so for several weeks before assessing its effect on their personal wellbeing.
• Do not exceed the stated dose on the product label.
• If you take any prescription medicines, particularly anticoagulants or epilepsy medicines, speak to your pharmacist before starting evening primrose oil. See the interactions section below.

Valupak Evening Primrose Oil 500 mg Capsules

Each 500 mg capsule provides approximately 500 mg of evening primrose oil, which typically contains around 40 to 50 mg of GLA. The 500 mg capsule is suitable for adults who prefer a smaller capsule size or wish to start at a lower daily dose. Taking two 500 mg capsules daily provides a similar amount of oil as one 1000 mg capsule. Always check the product label for the exact GLA content per capsule, as this can vary between batches.

Valupak Evening Primrose Oil 1000 mg Capsules

Each 1000 mg capsule provides approximately 1000 mg of evening primrose oil, typically containing around 80 to 100 mg of GLA. This is the standard strength for most adults taking evening primrose oil as a daily supplement. The 1000 mg capsule provides a convenient once daily dose option. Always check the product label for the exact GLA content per capsule.

Valupak Evening Primrose Oil is generally well tolerated by most adults at the recommended dose. Side effects are uncommon at standard supplemental doses.

Possible Side Effects

• Mild gastrointestinal effects such as nausea, indigestion, or loose stools, particularly if taken on an empty stomach.
• Headache, which has been reported occasionally in clinical studies of evening primrose oil.

Important Safety Considerations

• Epilepsy: evening primrose oil may lower the seizure threshold and should not be taken by people with epilepsy, or by those taking phenothiazine medicines (a class of antipsychotic and antinausea medicines), as the combination may increase the risk of seizures.
• Anticoagulant medicines: evening primrose oil may have a mild anticoagulant effect. If you take warfarin or other blood thinning medicines, speak to your GP or pharmacist before taking evening primrose oil.
• Surgery: evening primrose oil may affect bleeding. If you are due to have surgery, inform your surgical team that you take evening primrose oil and follow their guidance on whether to stop it before the procedure.
• Pregnancy: the safety of high dose evening primrose oil supplementation during pregnancy has not been established. Speak to your GP before taking evening primrose oil if you are pregnant or planning a pregnancy.

This Supplement May Be Suitable For:

• Adults who wish to take a daily source of GLA omega-6 fatty acids as part of their supplement routine.
• Adults interested in skin health and fatty acid nutrient support.
• Adults who do not have epilepsy and are not taking phenothiazine medicines.
• Adults not taking anticoagulant medicines, or those who have first confirmed suitability with their pharmacist or GP.

This Supplement Is Not Suitable For:

• People with epilepsy or those taking phenothiazine medicines, due to the risk of lowering the seizure threshold.
• People taking warfarin or other anticoagulants, without first speaking to their GP or pharmacist.
• Pregnant women, without first speaking to a midwife or GP.
• Children, unless specifically recommended by a healthcare professional.

Tell your pharmacist about all medicines you take before starting evening primrose oil. Key interactions include:

• Phenothiazines (such as chlorpromazine, prochlorperazine): the combination with evening primrose oil may increase the risk of seizures. This is a well-recognised interaction and evening primrose oil should be avoided by people taking medicines in this class.
• Warfarin and anticoagulants: evening primrose oil may enhance anticoagulant effects. INR monitoring may be appropriate if you take warfarin and choose to use evening primrose oil.
• Antiplatelet medicines (such as aspirin and clopidogrel): combined use may increase bleeding risk.

Valupak Evening Primrose Oil is a General Sale List product and does not require a prescription or pharmacist consultation. It can be purchased directly through Pharmacy Planet without a clinical consultation.

Pharmacy Planet is a GPhC registered online pharmacy. All products are genuine, properly stored, and handled by qualified pharmacy professionals. We stock a range of fatty acid supplements and botanical vitamins to support different aspects of daily health, including skin health and omega fatty acid nutrient support.

If you have questions about whether evening primrose oil is suitable for you, particularly if you take prescription medicines, our pharmacy team is happy to advise before you order.

Store in a cool, dry place below 25°C. Keep away from direct sunlight and heat. Evening primrose oil can oxidise when exposed to light and heat, which may reduce its quality. Keep the container tightly closed between uses. Refrigeration is not required but can help preserve the oil quality once opened, particularly in warm conditions. Keep out of the sight and reach of children. Do not use after the expiry date printed on the packaging. Full storage instructions are provided on the product packaging.

Pharmacy Planet is a GPhC registered online pharmacy committed to providing quality supplements and pharmacy products alongside honest, clear information. We believe every customer deserves straightforward facts about what they are taking and what the research shows. We stock a range of evening primrose oil products and fatty acid supplements suited to different daily supplement needs. All health claims on this page reflect the available evidence base and do not exceed what has been established in research or authorised under UK regulations. Our pharmacists are available to answer questions about any supplement or medicine we stock. We are committed to transparent, patient centred care.

References

1. NHS. Evening primrose oil. https://www.nhs.uk/medicines/evening-primrose-oil. Accessed May 2026.
2. European Food Safety Authority (EFSA). Scientific Opinion on the substantiation of health claims related to gamma-linolenic acid. EFSA Journal. https://efsa.onlinelibrary.wiley.com. Accessed May 2026.
3. Bamford JT et al. Oral evening primrose oil and borage oil for eczema. Cochrane Database of Systematic Reviews. 2013;(4):CD004416. https://doi.org/10.1002/14651858.CD004416.pub2. Accessed May 2026.
4. NHS. Vitamins and supplements — Omega-6 fatty acids. https://www.nhs.uk. Accessed May 2026.
5. Medicines and Healthcare products Regulatory Agency (MHRA). Yellow Card — report a side effect. https://yellowcard.mhra.gov.uk. Accessed May 2026.

Omega 3 and Fish Oil Capsules

The table below compares the five oil-based capsule supplements in the Vitamins range. All provide omega 3 or omega 6 fatty acids, but differ in oil type, strength, EPA and DHA content, and vitamin A status.

Important: This comparison is for general information only and does not replace medical advice. A prescriber will decide which treatment is suitable for you following an online consultation.