I would say that the topical agents that you can buy over the counter have been shown to be not very effective
Beta-Glucan hydrates
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Taking probiotics with food may improve tolerability and bacterial survival through the acidic stomach environment
Greek yogurt with 15 to 17 grams per serving, eggs with 6 grams each, cottage cheese with 25 grams per cup, and whey protein isolate with 25 to 30 grams per scoop are the most efficient delivery mechanisms
Where exercise really earns its place is in other beneficial side effects, including better sleep, lower stress, preserved muscle mass, and stronger long-term maintenance