What it is
Berberine is a plant alkaloid extracted from plants such as barberry. It has become very popular on social media with slogans comparing it to drugs. It has no authorised EU health claims and is not a substitute for any treatment.
What matters most at the counter is not what it promises but what it interacts with: it inhibits enzymes that metabolise many drugs and can add to the effect of antidiabetic medicines.
What is known
It acts on several metabolic pathways, and human studies are small and heterogeneous:
- It may lower glucose somewhat, and therefore adds to antidiabetic drugs.
- It inhibits liver enzymes (CYP3A4, CYP2D6) and transporters (P-glycoprotein).
- The commonest effects are digestive: diarrhoea, constipation, discomfort.
At the counter
When to recommend it
- There is no accepted indication to offer it as a substitute for anything
- If someone already takes it: ask what else they take and warn about interactions
- Any use, always with their doctor knowing if they take medication
When not to
- Pregnancy and breastfeeding: contraindicated (it can pass to the newborn)
- Children and newborns: contraindicated
- With antidiabetic drugs or insulin without their doctor's monitoring, or with ciclosporin, tacrolimus or narrow-margin drugs
Warnings
- Important PREGNANCY AND BREASTFEEDING: contraindicated. Berberine can displace bilirubin and favour severe neonatal jaundice.
- Important ANTIDIABETICS AND INSULIN: it can add to the effect and cause hypoglycaemia; do not take without their doctor knowing.
- Important NARROW-MARGIN DRUGS (ciclosporin, tacrolimus, digoxin, anticoagulants): enzyme inhibition can raise their levels.
- Caution Liver changes have been reported: with jaundice, dark urine or marked tiredness, stop and consult.
- Worth knowing On social media it is sold with promises no health authority has approved: do not repeat them.
Pharmacokinetics
- Absorption
- Poor by mouth: little reaches the blood.
- Distribution
- Spreads into tissues, especially the liver.
- Metabolism
- In the liver, with inhibition of several drug-metabolising enzymes.
- Elimination
- Mainly in faeces and a little in urine.
What is said and what exists
| Aspect | What social media says | What can be stated |
|---|---|---|
| Versus a drug | Comparable | Neither equivalent nor a substitute |
| Safety | "It is natural, it does nothing" | Interacts with many drugs |
| Evidence | Abundant | Small, heterogeneous studies |
| Authorisation | Taken for granted | No authorised health claim |
Natural is not a synonym of harmless, and this is proof of it.
Self-assessment
Three questions. When you check your answers you will see the explanation for each one.
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It can cause hypoglycaemia and disturb control; it is not a substitute.
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It can displace bilirubin in the newborn.
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No health claim is authorised, and it does not replace a treatment.
Training content. It does not replace the summary of product characteristics or clinical judgement.