Mo

Yes, rectal suppositories during a fast deliver medicine without meaningful calories or oral intake, so fasting typically continues.

Yes—small amounts of zero-calorie sweetener during intermittent fasting are generally fine, but any sugar or creamer breaks the fast.

Yes, stevia-based Truvia during a fasting window is generally fine; it adds near-zero energy and shows no rise in glucose or insulin.

Yes, most plain vitamins don’t break a fasting blood test, but biotin, iron, gummies, and oil-filled capsules can skew results for some panels.

Yes, pause most supplements before fasting blood tests; plain water and single-ingredient pills without calories are fine unless told otherwise.

Yes, you can usually take Tums while fasting for blood work, but skip it if your tests include minerals or if your clinician tells you not to.

Yes, most vaccines can be given during fasting; non-nutritive injections don’t break a fast and simple prep keeps you comfortable.

Yes, taking vitamins while fasting is possible, but fat-soluble ones absorb best with food.

Yes, some supplements fit a fasting window, but items with calories or that need food are better in your eating window.

No, vitamin gummies during fasting add calories and sweeteners that trigger digestion; use non-caloric forms or wait for your eating window.