There is not enough seb derm-specific evidence to call Tartaric Acid clearly helpful or harmful. It is mainly used to adjust pH and sometimes support exfoliation, not as a proven treatment for seborrheic dermatitis.

Alpha-hydroxy-acid effects depend strongly on concentration and final pH, and stronger use can cause burning, itching or irritation. That matters more during a flare when the skin barrier is already uncomfortable. A low amount used to balance a formula is very different from an exfoliating product, so let product strength and skin response guide the decision.