Can I take Ashwagandha and Vitamin C together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
- DownloadDownload
- Share
- Language
- Discussion
There are no known harmful interactions between ashwagandha and vitamin C. They are generally considered safe to take together.
In this article:
Video picks for Drug interactions
It is generally considered safe to take ashwagandha and vitamin C together. They do not share the same metabolic pathways in the liver, nor do they interfere with each other's absorption or excretion.
Ashwagandha is an adaptogenic herb that works primarily on the body's stress response system (the adrenal glands), while vitamin C is a water-soluble antioxidant.
Continue reading below
How to take ashwagandha and vitamin C safely
Take vitamin C with food to avoid stomach upset.
You can take ashwagandha at any time of day, though many people prefer taking it in the evening.
Always follow the dosage instructions on the product labels.
Important precautions
Back to contentsPregnancy
Do not use ashwagandha during pregnancy as it may have abortifacient effects (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.
Surgery requiring general anaesthesia
Ashwagandha may slow down the central nervous system; you must stop taking it at least 2 weeks before a scheduled surgery to avoid dangerous interactions with anaesthetics.
Kidney stones or chronic kidney disease
High doses of Vitamin C can increase oxalate levels in urine, significantly raising the risk of developing kidney stones or causing kidney damage.
Continue reading below
Food and drink warnings
Back to contentsAlcohol
Ashwagandha has sedative properties. Combining it with alcohol can increase drowsiness, sleepiness, and impaired coordination. It is best to avoid or strictly limit alcohol while taking this supplement.
Caffeine (coffee/tea)
Large amounts of caffeine may slightly increase the amount of Vitamin C excreted in your urine, potentially reducing its effectiveness over time. Try to space out your caffeine intake and your supplement.
Using other medicines
Back to contentsTaking 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

Treatment and medication
Can I take Levothyroxine and Liothyronine together?
Taking these two medicines together increases the total amount of thyroid hormone in your body. This can lead to symptoms of an overactive thyroid (hyperthyroidism), such as a racing heart, feeling shaky, anxiety, or difficulty sleeping.

Treatment and medication
Can I take Lercanidipine and Levothyroxine together?
There is no direct interaction between lercanidipine and levothyroxine. However, if your thyroid levels are not well-controlled, it can affect how your blood pressure medication works.
Continue reading below
Article history
The information on this page is written and peer reviewed by qualified clinicians.
25 Jan 2026 | Originally published

Ask, share, connect.
Browse discussions, ask questions, and share experiences across hundreds of health topics.

Feeling unwell?
Assess your symptoms online for free
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.