Can I take Black cohosh and Magnesium together?

Why this happens

Black cohosh and magnesium are processed by the body through different pathways. Black cohosh is primarily broken down by the liver, while magnesium is an essential mineral absorbed in the intestines and filtered by the kidneys. They do not interfere with each other's absorption or effectiveness.

What you should do

You can safely take these two supplements together. However, always follow the dosage instructions on the product labels. If you have pre-existing liver conditions (relevant to black cohosh) or kidney issues (relevant to magnesium), it is best to consult your GP or a pharmacist before starting new supplements.

Important precautions

Pregnancy

Do not use black cohosh during pregnancy. It may stimulate uterine contractions, potentially increasing the risk of miscarriage or premature labour.

Liver disease

Black cohosh has been linked to rare but serious cases of liver failure. You must stop taking it and see a doctor immediately if you develop yellowing of the skin or eyes, dark urine, or severe stomach pain.

Hormone-sensitive conditions (e.g. breast cancer)

Because black cohosh may act like the hormone oestrogen, you should not use it if you have a history of breast cancer, uterine cancer, or endometriosis without specialist medical supervision.

Kidney disease

If you have reduced kidney function, your body cannot clear magnesium properly. This can lead to dangerously high levels in the blood, which can cause heart rhythm problems and muscle weakness.

Food and drink warnings

Alcohol

Black cohosh has been linked to rare but serious cases of liver damage. Because alcohol also puts strain on the liver, it is advisable to limit or avoid alcohol consumption while taking this supplement to reduce the risk of liver toxicity.

Dairy products (Milk, Cheese, Yoghurt)

Dairy products are high in calcium. Taking large amounts of calcium at the same time as magnesium supplements can interfere with how well your body absorbs the magnesium. It is best to space them out by at least 2 hours.

Using other medicines

Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.