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For example, growth hormone is secreted from the anterior pituitary; is it also synthesized there?

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For many, yes. But for some, like oxytocin and ADH, which are secreted from posterior pituitary, are synthesised in hypothalamus, the sites are different

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  • $\begingroup$ Ah, I remember learning about that for those two, for sure. Thank you. $\endgroup$ Commented Mar 28, 2018 at 23:36
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Vitamin D is synthesized in multiple sites though classically it is said that final hydroxylation occurs in the kidneys.

Vitamin D is a hormone the kidneys produce that controls blood calcium concentration and impacts the immune system. It is also known as calcitriol, ergocalciferol, calcidiol and cholecalciferol. Of those, calcidiol is the form doctors most commonly focus on when measuring vitamin D levels in the blood.

The body makes vitamin D in a chemical reaction that occurs when sunlight hits the skin. This reaction produces cholecalciferol, and the liver converts it to calcidiol. The kidneys then convert the substance to calcitriol, which is the active form of the hormone in the body.

https://www.hormone.org/hormones-and-health/hormones/vitamin-d

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