Tempe, a fermented soybean product from Indonesia, showcases how fermentation enhances nutritional value and digestibility. Rhizopus oligosporus, a key starter culture in tempe production, enzymatically enhances carbohydrate, vitamin, and mineral availability from raw soybeans. This process also boosts bioactive compounds such as γ-aminobutyric acid (GABA), recognized for its role as an in…