Bifidobacterium bifidum is a beneficial bacterium that lives in the human gut. People take it as a probiotic to keep gut flora balanced, ease digestion, and help the immune system work well.
Capsule, powder, and tablet forms are common. Take them with a meal so more bacteria survive stomach acid. Some products need refrigeration to stay potent. When you are on antibiotics, you can use this probiotic to reduce digestive upset, but take it at a different time of day.
People with weakened immune systems or those recovering from a major illness should talk to a doctor before starting any probiotic.