Am I permitted to take a probiotic I take every day during the week on Shabbos? It was recommended by my doctor that I take it everyday but I don’t take it for any serious illness, etc. I am considered a healthy individual (not a choleh)…
Yes, it may be taken on Shabbos.
Probiotics are not medicine, rather a supplement intended to maintain one’s health. They would then have the status of vitamins which one may take on Shabbos.
Igros MOshe O:C Volume 3, Simna 54, Anaf 4, s”v Vachar Shenisbaer