Contains small amounts of pyrrolizidine alkaloids which may be toxic to the liver even in small amounts. The long-term use in medicinal preparations is not recommended.
leaves and flowers
No necessary precautions to observe in the diet.
Not to be taken by pregnant or nursing women. Use precautions when identifying the herb, often confused with hemlock parsley and poison hemlock.
Encomia bark has a long history of use with no substantial reported problems.
Eucommia bark has a long history of use with no substantial reported problems.
Polysomnography is extremely safe and no special precautions need to be taken.
without specifics my answer would be rosemary, or borage.
No particular precautions have been reported as being necessary in using cyperus.
Country borage leaf
Use externally with caution, and only in diluted preparations. Discontinue if a skin rash develops, and do not use on broken skin.
No special precautions are necessary when cuscuta is used in the doses normally prescribed by herbalists.
Not to be taken during pregnancy.