“First, pause all protein-based products, including conditioners, masks, leave-ins and styling treatments labelled ‘repair,’ ‘strengthening’ or ‘bond-building,’” Mroczka said, noting that in some cases, this may also include protein-heavy shampoos.
Article source: https://www.huffingtonpost.co.uk/entry/protein-overload-hair-impact_uk_69ca9545e4b0128a9ef8b79d