Adrenal glandular supplements contain desiccated, powdered adrenal tissue from animals, typically cows or pigs. Makers claim the tissue supplies peptides and nutrients that support your own adrenal glands during periods of stress. The market pushes these for occasional fatigue and a flagging stress response.
Quality swings widely between brands. The concept behind them remains controversial and hard evidence is thin. Common uses center on energy support and stress management, particularly when people feel worn down or notice their patience wearing thin.