AntibioticsAntibiotics are medicine that kill bacteria. They only work against bacteria and don't kill viruses; so they won't work against the flu, or other viral illnesses. They can kill most of the bacteria in your body that are sensitive to them, even the "good" bacteria that help your body. Antibiotics can ruin the balance of bacteria in your body, leading to an upset stomach, diarrhea, a vaginal infection, or other problems.
ProbioticsProbiotics are live bacteria and yeasts that are good for your health, especially your digestive system. We usually think of bacteria as something that causes diseases. But your body is full of bacteria – both good and bad. Probiotics are often called "good" or "helpful" bacteria because they help to keep your gut healthy. Probiotics are naturally found in your body. You can also find them in some foods. When you lose "good" bacteria in your body (like after taking antibiotics, for example), probiotics can help replace them.
PrebioticsPrebiotics are natural, non-digestible fibers that trigger the growth of bacteria having good effects on the intestinal flora. Simply put, they're "good" bacteria promoters. Good sources of prebiotics include acacia gum, dandelion greens, garlic, asparagus, beans, chicory root, onions, artichokes, tiger nuts and whole- wheat foods, if you’re not allergic to them.
PsychobioticsPsychobiotics are actually live microbes in the human body that have a beneficial, psychoactive (affecting the mind) effect on our mood and brain function. A number of animal studies have demonstrated the stress-relieving effects of probiotics on mice, but human studies are coming to the same conclusions. Certain strains of probiotics—psychobiotics—communicate with the brain by producing neurotransmitters like GABA (the “calming” chemical) and serotonin (the “happy” chemical) .
Psychobiotics can also reduce levels of cortisol (the “stress” hormone) and increase levels of oxytocin (the “cuddle” hormone). So far, the research on psychobiotics is still preliminary; a great deal more research on humans is needed.