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Joyful Belly article on pancreatic insufficiency: https://www.joyfulbelly.com/Ayurveda/symptom/Pancreatic-Insufficiency/432

Do Air Purifiers Remove PM2.5? https://smartairfilters.com/en/blog/do-air-purifiers-remove-pm2-5/

Current Knowledge and Perspectives of Pyrrolizidine Alkaloids in Pharmacological Applications: A Mini-Review https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8037423/

Occurrence and Risk Assessment of Pyrrolizidine Alkaloids in Spices and Culinary Herbs from Various Geographical Origins https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7150964/

Risks for human health related to the presence of pyrrolizidine alkaloids in honey, tea, herbal infusions and food supplements https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2017.4908

A good presentation (although not from the herbal point of view): https://www.ars.usda.gov/ARSUserFiles/20801500/PALecture2010.pdf

The concerning food safety issue of pyrrolizidine alkaloids: An overview https://www.sciencedirect.com/science/article/pii/S0924224422000073

Let's talk about pyrrolizidine alkaloids (PAs). Pyrrolizidine alkaloids are found in a large number of plants, including many herbs. In most of the traditionally used herbs that have PAs, they haven't seemed to be an issue (but do note the usage is usually short term). However, given that...

I only heard about this very recently:

An Exploration of the Conceptual Foundations of Western Herbalism and Biomedicine by Matthew Wood https://www.matthewwoodherbs.com/Dissertation.html

Maybe the physical benefits are incidental? Effects of ayahuasca on mental health and quality of life in naïve users: A longitudinal and cross-sectional study combination https://www.nature.com/articles/s41598-020-61169-x