Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Camellia sinensis, the plant from which green, black, white, and oolong teas are derived, has a long history of use in traditional medicine, but its support for the glandular (endocrine) system is primarily backed by modern scientific research. Key bioactive compounds in Camellia sinensis, such as catechins (notably epigallocatechin gallate, EGCG), caffeine, and L-theanine, have been studied for their effects on various endocrine glands and hormones.

Scientific studies show that green tea polyphenols may influence metabolic rate and fat oxidation, indirectly impacting the thyroid and adrenal glands. For example, caffeine and catechins can stimulate thermogenesis and may modestly support thyroid function, although effects are generally mild. Several studies also suggest that green tea consumption may help regulate insulin sensitivity and glucose metabolism, supporting pancreatic function and potentially reducing the risk of type 2 diabetes.^1,2

However, robust clinical trials specifically demonstrating direct, significant benefits of Camellia sinensis on overall glandular (endocrine) health in humans are limited. While laboratory and animal studies provide mechanistic insights, direct evidence in humans is often indirect or observational. Therefore, the scientific support for Camellia sinensis benefiting the glandular system is moderate but not conclusive. Most recognized effects relate to metabolism, stress response, and glucose regulation rather than broad, direct glandular support.

1. Thielecke, F., & Boschmann, M. (2009). The potential role of green tea catechins in the prevention of the metabolic syndrome – A review. Phytochemistry, 70(1), 11-24.
2. Venables, M. C., et al. (2008). Green tea extract ingestion, fat oxidation, and glucose tolerance in healthy humans. The American Journal of Clinical Nutrition, 87(3), 778-784.

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