The major form of thyroid hormone in the blood is thyroxine (T4), which has a longer half-life than T3. In humans, the ratio of T4 to T3 released into the blood is between 14:1 and 20:1. T4 is converted to the active T3 (three to four times more potent than T4) within cells by deiodinases (5'-iodinase).
Solanine is the toxin (Glycoalkaloid Poison) contained in all nightshade plants such as tomatoes, potatoes, and goji berries. It can occur naturally in any part of the plant, including the leaves, fruit, and tubers. Solanine has fungicidal and pesticidal properties. Again, it is one of the plantâs natural defenses.
In poisonous nightshades, the high alkaloid content is what gives the plant its toxic properties. In the edible vegetables, though, the alkaloid content is much, much lower. For the majority of the population, alkaloids have no effect on the body.