Pituitary supplements come from the pituitary glands of animals, usually cattle. People take them on the belief that eating glandular tissue can shore up the matching human gland. Some turn to these capsules for general endocrine support, stress resilience, or energy. The standard advice is to take them on an empty stomach.
A major caution applies here. The pituitary makes many hormones, and swallowing foreign gland material could disrupt your own hormone balance. Evidence for both effectiveness and safety remains thin. Speak with a healthcare professional before considering this supplement.