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Coltsfoot at a Glance
Tussilago farfara is a perennial in the Asteraceae family whose yellow flowers often emerge before the broad leaves. It has a very old European respiratory-herb reputation.
Traditional Use
Coltsfoot leaves and flowers were historically used in teas, syrups and even smoke preparations for cough and chest complaints. Traditional use does not establish treatment of asthma, bronchitis or infection.
Pyrrolizidine Alkaloids
Coltsfoot can contain pyrrolizidine alkaloids, or PAs, that may damage the liver. PA content varies with plant material and processing, but ordinary wild or unverified coltsfoot should not be assumed safe for internal use.
Modern Safety
Routine internal use of unverified coltsfoot is not recommended. If a product is intended for internal use, verified PA-free or tightly controlled material is essential. Pregnancy, breastfeeding, childhood and liver disease are strong reasons to avoid unsupervised use. Smoking coltsfoot exposes the lungs to smoke and is not a safe respiratory treatment.
Research
Modern human evidence is limited and does not outweigh the PA safety concern.
Folklore
The plant’s unusual flowering pattern and early spring appearance gave it associations with persistence and return.
Bottom Line
Coltsfoot is historically important but carries a serious PA-related liver-safety issue. Traditional reputation should not override modern toxicology. For educational purposes only.