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www.aaiclinics.com/how-is-testosterone-produced

The two types of testosterone produced: natural and synthetic. Naturally, Occurring Testosterone Produced in the Body. Testosterone is a naturally occurring hormone that’s produced in both men in women. Men produce large amounts of it relative to women, while women produce large amounts of estrogen on levels that men don’t.

en.wikipedia.org/wiki/Testosterone

Testosterone is also synthesized in far smaller total quantities in women by the adrenal glands, thecal cells of the ovaries, and, during pregnancy, by the placenta. In the testes, testosterone is produced by the Leydig cells. The male generative glands also contain Sertoli cells, which require testosterone for spermatogenesis.

www.hght.com/testosterone/synthetic-testosterone

When looking at testosterone, synthetic versions are not completely identical to the naturally occurring hormone when in the form of an injectable testosterone ester because it is no longer identical to the molecular structure of natural testosterone.

www.webmd.com/fitness-exercise/features/steroid-doping-questions-answers

Question: What is synthetic testosterone? Answer: This anabolic steroid is a form of testosterone usually produced from soy or yams in factories, not the human body. It can be introduced into the ...

www.quora.com/What-is-synthetic-testosterone-and-how-is-it-manucfactured

Synthetic testosterone is ALMOST chemically identical to naturally occurring testosterone. The big difference is that it's made (synthesised) in a laboratory. There is a way of telling the very small chemical difference for drug testing, but your ...

www.nytimes.com/2005/06/20/health/menshealth/synthetic-testosterone-seemed...

Health | Synthetic Testosterone Seemed Like a Good Idea. Then Came Fertility Issues. ... "No one told me that if I used this synthetic testosterone it wouldn't allow me to produce sperm," he said ...

www.merriam-webster.com/dictionary/testosterone

Testosterone definition is - a hormone that is a hydroxy steroid ketone C19H28O2 produced especially by the testes or made synthetically and that is responsible for inducing and maintaining male secondary sex characters.

medlineplus.gov/druginfo/meds/a614041.html

Testosterone is a hormone produced by the body that contributes to the growth, development, and functioning of the male sexual organs and typical male characteristics. Testosterone injection works by supplying synthetic testosterone to replace the testosterone that is normally produced naturally in the body.

www.steroidology.com/.../606997-true-they-make-synthetic-testosterone.html

I had a hunch that synthetic anabolic steroids were made from the parent chemical, testosterone. However, after reading that Dianabol is made as an intermediate, I am not sure if testosterone is made first, and then modified, or if Dianabol can be synthesized before ever arriving at the structure of testosterone.

ftmguide.org/bioidenticalt.html

Oral testosterone modifications In the case of oral delivery, modifications have been made to the testosterone molecule to try to combat problems caused by the "first pass effect." Drugs that are taken orally (i.e., swallowed) are absorbed from the gastrointestinal tract and pass via the portal vein into the liver.