Can I take Ashwagandha and Vitamin B complex together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
- DownloadDownload
- Share
- Language
- Discussion
- Ask Patient
- Audio Version
- Add to preferred sources on Google
There are no known harmful interactions between ashwagandha and Vitamin B complex. In fact, they are often taken together to help manage stress and energy levels.
Video picks for Drug interactionsVideo library
It is usually safe to take ashwagandha and vitamin B complex together.
Ashwagandha is an adaptogenic herb that helps the body manage stress, while Vitamin B complex supports energy metabolism and nervous system function.
They work through different pathways in the body and do not interfere with how the other is absorbed, broken down, or used.
How to take ashwagandha and vitamin B complex safely
Always follow the dosage instructions on the product labels.
If you have an underlying medical condition (such as a thyroid disorder or autoimmune disease), speak with your GP or a pharmacist before starting ashwagandha.
Important precautions
Pregnancy
Do not use ashwagandha during pregnancy as it could cause a miscarriage.
Autoimmune diseases
Ashwagandha can stimulate the immune system, which may worsen the symptoms of autoimmune conditions such as lupus, rheumatoid arthritis, and MS.
Hyperthyroidism (overactive thyroid)
Ashwagandha can increase thyroid hormone levels. You must avoid it if you have an overactive thyroid, as it may worsen your condition or interfere with thyroid medications.
Scheduled Surgery
Stop taking ashwagandha at least 2 weeks before surgery; it can slow down the central nervous system and may dangerously increase the effect of anaesthesia.
Food and drink warnings
Alcohol
It is best to avoid or strictly limit alcohol while taking ashwagandha as it has sedative properties and may enhance the effects of alcohol.
Combining them can lead to excessive drowsiness, impaired coordination, and slowed reaction times.
Dairy products
While dairy is a good source of B vitamins, taking a B complex supplement with a very large amount of dairy may slightly alter the absorption rate of Riboflavin (B2).
However, for most people, taking them together is acceptable unless specified by a doctor.
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.
Patient picks for Drug interactions

Drug interactions checker
Can I take Magnesium and Wegovy flextouch together?
There is no known direct interaction between magnesium supplements and Wegovy (semaglutide). However, both can affect your digestive system. Wegovy slows down how quickly your stomach empties, which could theoretically change how quickly your body absorbs magnesium, though this is rarely a clinical concern. Additionally, both can cause side effects like nausea or changes in bowel habits (magnesium often softens stools, while Wegovy can cause constipation or diarrhoea).

Drug interactions checker
Can I take Flecainide and Wegovy together?
Wegovy (semaglutide) can slow down how quickly your stomach empties. This might change how your body absorbs flecainide, which is a medicine that needs to be kept at very specific levels in your blood to work safely and effectively. Additionally, both medications can occasionally affect your heart rhythm or heart rate.
Share your thoughts or experiences with others in our patient communities.
Sign up to the Patient newsletter
Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.
By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.

