Boron: what it does and how much you need
Boron is a trace element found in plant foods. No daily need has been set for it. There is no set daily amount for boron, and the upper limit is 20 milligrams a day.
General information, not medical advice. Check with a doctor or pharmacist before taking a supplement, especially if you are pregnant or breastfeeding, take any medicine, or are under 18.
How much you need and the upper limit
| Adults need | No set daily amount for boron |
|---|---|
| Upper limit | 20 milligrams a day |
These are the US (NIH) figures for adults. Supplement Check has no separate NHS figure for boron.
Food sources
- Prune juice
- Avocados
- Raisins
- Peaches
- Peanuts
- Apples
Quick answers
- What does boron do?
- Boron is a trace element found in plant foods. No daily need has been set for it.
- How much boron do adults need?
- There is no set daily amount for boron (US, NIH).
- What is the upper limit for boron?
- US: 20 milligrams a day.
- Which foods have boron?
- Prune juice, avocados, raisins, peaches, peanuts, apples.
Sources
- NIH Office of Dietary Supplements fact sheet
https://ods.od.nih.gov/factsheets/Boron-HealthProfessional/
Ask Supplement Check yourself
Type a vitamin, mineral or supplement, a dose, or a product name, and get the daily need, the upper limit and any cautions. Open Supplement Check, free, no sign-up.
In Claude or any app that takes MCP connectors, add https://goodturn-mcp.pages.dev/supplementcheck/mcp and ask: “How much boron do I need?”