Herbalism Herbal Safety & Contraindications 2 — Questions and Answers
Question 1: Which organ system is most commonly the target of herb-induced toxicity in documented adverse event reports?
- Kidneys
- Lungs
- Liver (Correct answer)
- Heart
Correct answer: Liver
The liver is the most frequently implicated organ in herbal toxicity because it is the primary site of metabolism for most plant constituents.
Question 2: Bloodroot (Sanguinaria canadensis) is considered unsafe for internal use in therapeutic doses because it contains:
- Oxalic acid causing kidney stones
- Sanguinarine, a cytotoxic alkaloid toxic to mucous membranes (Correct answer)
- High selenium causing selenosis
- Coumarins causing anticoagulation
Correct answer: Sanguinarine, a cytotoxic alkaloid toxic to mucous membranes
Sanguinarine is a toxic alkaloid that damages mucous membranes and has caused serious oral lesions when used in dental products; internal use is dangerous.
Question 3: Herbs in the Apiaceae (carrot/parsley) family used topically can cause severe blistering burns when skin is exposed to sunlight due to which compound class?
- Tannins
- Anthocyanins
- Furanocoumarins (psoralens) (Correct answer)
- Saponins
Correct answer: Furanocoumarins (psoralens)
Furanocoumarins (psoralens) in plants like wild parsnip, giant hogweed, and rue react with UV light to cause phototoxic burns and blisters.
Question 4: Which safety category should an herbalist assign to herbs that have no documented human safety data and are used during breastfeeding?
- Safe to use as a food only
- Avoid unless clearly necessary; default to caution (Correct answer)
- Safe in any amount because breast milk dilutes the dose
- Only avoid if the mother is allergic
Correct answer: Avoid unless clearly necessary; default to caution
When safety data for lactation is absent, the precautionary principle applies: avoid or minimize use because many plant constituents pass into breast milk.
Question 5: High doses of which fat-soluble herbal constituent can accumulate to toxic levels with prolonged use?
- Water-soluble vitamin C from rose hips
- Fat-soluble vitamin A from high-dose sea buckthorn (Correct answer)
- Tannins from black tea
- Inulin from chicory root
Correct answer: Fat-soluble vitamin A from high-dose sea buckthorn
Fat-soluble compounds, including preformed vitamin A (retinol) found in concentrated sea buckthorn and similar sources, can accumulate in body fat and reach hepatotoxic levels.
Question 6: An herb marketed as 'natural' is ethically described to a client as potentially unsafe because:
- Natural products are regulated more strictly than pharmaceuticals
- Natural origin does not confer safety; many plant compounds are highly toxic (Correct answer)
- The word natural is a legal guarantee of no side effects
- Plants cannot cause drug interactions
Correct answer: Natural origin does not confer safety; many plant compounds are highly toxic
Many of the most toxic substances known (ricin, aconitine, hemlock alkaloids) are entirely natural; natural origin is not a reliable indicator of safety.
Herbalism Herbal Safety & Contraindications 2
Which organ system is most commonly the target of herb-induced toxicity in documented adverse event reports?