Abstract Background Re-excision due to positive margins following breast-conserving surgery (BCS) negatively affects patient outcomes and healthcare costs. The inability to visualize margin involvement is a significant challenge in BCS. 5-Aminolevulinic acid hydrochloride (5-ALA HCl). a non-fluorescent oral prodrug. https://hollandscountryclothinges.shop/product-category/wellingtons/