Natural does not mean safe. Many plants contain potent compounds that can cause harm in the wrong dose or context. This lesson covers the essentials every herbalist must know.
Start Low, Go Slow
Always begin with the lowest effective dose. Your response to a herb depends on your weight, genetics, gut microbiome, and current medication load. The therapeutic window (between 'no effect' and 'too much') varies enormously between individuals.
Critical Drug Interactions
St. John's Wort is the most dangerous herb for interactions — it strongly induces CYP3A4, cutting blood levels of dozens of drugs by 30–70%, including the contraceptive pill, HIV medications, warfarin, and immunosuppressants. Always check interactions if on prescription medication.
Herbs to Avoid in Pregnancy
Avoid: Blue cohosh, pennyroyal, mugwort, large doses of turmeric or ginger, tansy. Generally safe: ginger (in food amounts), chamomile tea (occasionally). When in doubt, avoid all herbs not cleared by your midwife or physician.
Quality Matters
Commercial herbal products vary enormously in potency. Look for: GMP certification, third-party testing, standardised extracts with known active concentrations. Avoid products without a Certificate of Analysis (CoA).
When to Stop
Discontinue any herb if you notice: rash, GI distress, mood changes, headaches, or worsening of your condition. Some reactions are detox responses; others are genuine adverse effects. Track symptoms in your Herb Journal to distinguish patterns.