“Doc, I read on the Internet that probiotics might help me. Is it true?”

Patrick Alexander Wachholz  is a Geriatrician, Research associate at Botucatu Medical School, São Paulo State University (UNESP). His paper Effectiveness of probiotics on the occurrence of infections in older people: systematic review and meta-analysis was recently published in Age and Ageing journal.

In 2001, an international Joint Expert Consultation of sci­entists working on behalf of the Food and Agriculture Organization of the United Nations (FAO) and the World Health Organization (WHO) defined probiotics as “live microorganisms which, when administered in adequate amounts, confer a health benefit on the host”.

Probiotics are intended to have health benefits, and in some countries we can find a huge variety of products sold as probiotics including foods (such as yogurt and fermented milk), dietary supplements, and products that aren’t used orally, such as skin or vaginal creams.