Source of non-essential amino acids that are involved in protein synthesis.
One example of tissue active substances present in appropriately processed glandular materials in the finding that concentrated adrenal tissues contain small but active concentrations of the enzymes capable of converting cholesterol to corticosteroid substances which can elicit adrenal-specific activities. As was pointed out in the Annual Review of Biochemistry (33,34), these corticosteroid substances, even though promoted in trace amounts in adrenal concentrates, can have fairly profound peripheral tissue influences on gluconeogenesis, glycolysis, and insulin sensitivities. It can be seen then that the ingestion of adrenal glandular materials may allow for the absorption of small but tissue-potentiating amounts of stimulatory substances for the steroid family which are peptide in nature.
- Adrenal Stress
 Jeffery Bland, Historical use of Biological Basis for and Preparation of Glandular-based Food Supplements, 1979, p. 33-34)