
Made for you if…
- You read the label before you buy anything.
- You want a berberine with a dose you can actually check.
- You like habits that fit your meals, not your alarm clock.
- You want honest answers about side effects and medication, not hype.
Not for you if you are pregnant, trying to conceive or breastfeeding, or under 18. Taking prescription medicine? Talk to your doctor first.

Many bottles hold less than the label says
In a test the supplement maker NOW Foods published in December 2023, 18 of 33 berberine brands sold on Amazon and Walmart.com contained less than 40% of the berberine on their label. You can do all the research in the world and still end up with a bottle that falls short.
So we do it differently: 1,200 mg berberine per serving, the full label on this page, and a certificate of analysis for every batch. Ask for yours and see the result for the bottle you hold.
Berberine you don't have to second-guess
Before you buy any berberine, check this
- The dose per serving. Ours: 1,200 mg per 2 capsules, printed on this page.
- Proof for your batch. Ours: a certificate of analysis for every batch, on request.
- How to take it. Ours: split over lunch and dinner, with food.
- Clear warnings. Ours: pregnancy, medication and side effects explained.
- A clear return policy. Ours: unopened bottles can be returned within 30 days of delivery.
What's inside
What to expect

How to take it
Take 1 capsule with lunch and 1 with dinner, or as directed on the label. Taking berberine with food helps if it upsets your stomach. If it does, start with 1 capsule a day for the first week.
Do not take more than 2 capsules a day.
Check the dose yourself
Every batch has a certificate of analysis (COA). Email support@mavrena.shop with the lot number on your package and we'll send you the certificate for your batch. Want to see it before you buy? Email us and we'll send the certificate for the batch we're shipping now.
Berberine questions
How do I know it really contains 1,200 mg?
How do I know it really contains 1,200 mg?
Every batch has a certificate of analysis (COA). Email support@mavrena.shop with the lot number on your package and we'll send you the certificate for your batch. Want to see it before you buy? Email us and we'll send the certificate for the batch we're shipping now.
How much berberine is in one serving?
How much berberine is in one serving?
1,200 mg berberine per 2 capsules. One bottle has 60 capsules: 30 servings, a 30-day supply.
When should I take it?
When should I take it?
With meals: 1 capsule with lunch and 1 with dinner, unless the label says otherwise.
Will it upset my stomach?
Will it upset my stomach?
It can. Stomach pain, constipation, diarrhea and nausea are the most common side effects. Take it with food. If your stomach is sensitive, start with 1 capsule a day for the first week.
Can I take berberine with my medication?
Can I take berberine with my medication?
Ask your doctor or pharmacist first. Berberine can change how some medicines work, especially diabetes medicines, cyclosporine or tacrolimus, blood thinners and medicines processed by the liver.
Who should not take berberine?
Who should not take berberine?
People who are pregnant, trying to conceive or breastfeeding, children and infants. Talk to your doctor first if you have a medical condition.
How long should I take it?
How long should I take it?
In studies, people took berberine every day for 8 to 12 weeks. Want to take it longer? Check with your doctor.
Is there a gift with the biggest pack?
Is there a gift with the biggest pack?
Yes. With the biggest pack you get our free eBook, The Mavrena Routine Guide (PDF): how to build a routine that sticks, how to read a Supplement Facts label, and tips for each of our supplements. The download link is in your order confirmation email.
Is this a subscription?
Is this a subscription?
No. You pay once and you won't be charged again. Order again whenever you want.
How long does shipping take?
How long does shipping take?
Most orders arrive in 4 to 7 business days (Monday to Friday). Shipping is free on every US order, and the estimated delivery dates are shown above the Add to cart button. You get a tracking link by email once your order ships. See our Shipping Policy.
Can I return my order?
Can I return my order?
You can return unopened products within 30 days of delivery for a refund of the product price. Email us first; the return shipping is paid by you. If a product arrives damaged, defective or wrong, email us a photo and we'll replace or refund it at no cost to you. See our Refund Policy.
How do I reach you?
How do I reach you?
Email support@mavrena.shop or call +1 716-300-1335. We reply to every email within 1 business day (Monday to Friday).