Probiotics are affected by your unique gene makeup, age, and microbiome you already have in your body and diet. Reasons why a probiotic may not work include:
Malini Ghoshal, RPh, MS. Jillian Kubala, MS, RD. (2020). ‘How Long Does It Take for Probiotics to Work?’ Healthline. 14 January. Available at: <https://www.healthline.com/health/probiotics-and-digestive-health/how-long-does-it-take-for-probiotics-to-work#research>
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