What are heavy metals?
Heavy metals such as lead, mercury and arsenic are toxic elements that can build up in the body over time and damage the brain, nerves, kidneys and heart.
Think of heavy metals like coins dropped into a jar with no way out. Each small dose may seem harmless, but they slowly accumulate, and the body has a hard time emptying the jar.
Why it matters for aging
Some traditional preparations, especially Ayurveda's rasa shastra medicines, intentionally include metals and minerals, and these had the highest contamination rates. Other herbs can pick up metals from polluted soil or poor manufacturing.
The best protection is choosing supplements with independent third-party testing, avoiding products that list metals or minerals as ingredients without testing data, and telling your doctor about every herbal product you take.
A common myth
Natural or herbal products are free of toxins.
Plants and minerals can absorb heavy metals from soil and rock. In a US study, about one in five Ayurvedic medicines bought online contained lead, mercury or arsenic, and every contaminated product exceeded at least one safety limit.
Go deeper
Deep dives
- Ayurveda and longevity: what science says about the ancient system
- Shilajit: benefits, claims and heavy-metal risk
Related terms
Updated Nov 9, 2026 · All terms