This causes the hormones to be blocked from the receptor sites. Steroids are a product of cholesterol. Estrogens, progesterone, testosterone etc. Fatty acid derivatives, peptides and proteins. Pregnelone is secreted from cholesterol and rapidly secreted from the cell inactivated and excreted through urine or bile.
Hormones can affect menopause, libido, impotence and fertility.
Thyroid hormones are derived from the Amino acid tyrosine. Once in circulation they have a half life of a few days. When hormone levels become too low or too high, disease become inevitable. The concentration of hormones is based on rate of production, rate of delivery and rate of breakdown and elimination. Hormones are chemical messengers that circulate in the blood stream and affect specific cells that have receptor sites for that particular hormone.