What are the most common skin irritants? I think I’m having issues with fragrance, and many natural oils including rosemary. Any others for my low-estrogen, high-histamine perimenopausal skin? Thank you! X

You are right, fragrance, all essential oils + most (not all) plant extracts are likely irritants (plant extracts that can be helpful are colloidal oatmeal, green tea and centella asiatica). Also, avoid formaldehyde-releasing preservatives including diazolidinyl urea, imidazolidinyl urea, quaternium-15, DMDM hydantoin, sodium hydroxymethylglycinate. Maybe this blog-post can help you as well: https://whatsinmyjar.com/entries/77/sensitive-skin-reactive-skin-what-to-avoid