Bifidobacterium longum is a beneficial bacteria native to the human gut. Taking it as a supplement helps keep your gut flora in balance.
The supplement supports digestive health and can strengthen immune defenses. It also appears to influence the gut-brain connection, which might affect mood.
You can find it as capsules, tablets, or powders. Take one dose daily with food to help the bacteria survive stomach acid. Refrigeration is needed for certain strains.
Anyone with a weakened immune system should speak to a doctor before using it. You might get mild bloating or gas when starting.