With Garlic Extract Plus Olive Leaf Extract, Elderberry & Oregano Oil A Dietary Supplement How It Works: A-Biotic is a botanical formula with garlic designed to support healthy immune system function. Garlic has been used for centuries by traditional herbalists. The A-Biotic formula also includes Elderberry concentrate, standardized Olive Leaf extract, ImmunEnhancer (a proprietary Larch extract), as well as oregano and rosemary oils.