Abstract Mali national policy recommends that women take iron and folic acid supplements (IFA) from the time of the first antenatal care (ANC) visit, throughout pregnancy and during the first 3 months after delivery. In 2020, the World Health Organization (WHO) updated their ANC guidelines to recommend the United Nations International Multiple Micronutrient Antenatal Preparation (UNIMMAP) formulation of multiple micronutrient supplements (MMS) in the context of rigorous research, including implementation research. In Bamako, Mali, a codesign process was used to tailor antenatal care MMS packaging and counselling materials aimed at optimizing delivery and uptake of and adherence to MMS. This paper presents the codesign process along with the results of a post‐intervention qualitative assessment to evaluate the behaviour change intervention. At the conclusion of the intervention, we conducted semistructured qualitative interviews with 24 women who had received the intervention and six pharmacy managers from the six health centres participating in the study. We conducted two focus groups with midwives who had delivered the intervention and two group discussions with family members of women who had received the intervention. Respondent perspectives reveal an easy experience transitioning from previously used IFA. Women and providers concur that the intervention counselling materials and visual aids were instrumental in influencing the perceived benefit and uptake of MMS. Family members play an influential role in pregnant women's decision‐making regarding MMS uptake. MMS and the associated implementation strategies developed through the codesign process were found to be a highly acceptable intervention. , Key messages United Nations International Multiple Micronutrient Antenatal Preparation (UNIMMAP) multiple micronutrient supplementation (MMS) and the associated implementation strategies developed through the codesign process were found to be highly acceptable interventions. Any national transition from iron and folic acid supplements to MMS will need to include planning and budgeting for necessary resources, training on antenatal care MMS counselling and ongoing supportive supervision to antenatal care providers. Additional implementation strategies might focus on community‐based behaviour change strategies that support the uptake of and adherence to MMS as well as supply chain mechanisms to support a reliable and sustainable stock of UNIMMAP MMS.