9 natural remedies for immune system function

Remedy (click for Amazon user reviews)
Side effects
a form of vitamin B6

Blue-green algae encompass a large group of simple, plant-like organisms found underwater

a vitamin involved in the metabolism of every cell in the human body

a water-soluble B vitamin

a resin-like material taken from the buds of trees

technically a bacteria and is cultivated for medicinal purposes

a group of unsaturated nutritional organic compounds

a type of bacteria commonly found in the gut

a B vitamin