By Tarun Sai Lomte Reviewed by Susha Cheriyedath, M.Sc. Mar 23 2025 Could your gut bacteria decide how well vaccines work? A new study reveals how diet and probiotics could hold the key to stronger, longer-lasting immune protection. Study: Diet, microbiome, and probiotics establish a crucial link in vaccine efficacy . Image Credit: Helena Nechaeva / Shutterstock A recent study published in the journal Critical Reviews in Microbiology reviewed how probiotics and diet modulate the gut microbiome