Anol is produced in human sweat glands in small amounts. So it is found in the body we just dont secrete it as much as others.
Anone is a steriod metabolised from testosterone. You find it in urine and sweat.
Many pheromones are derived from hormones at different points of metabolizing in the body. So one derives from another
A small amount of conversion can occur if bacteria continues the metabolization process outside the body but these pheromones/hormones exist in the body independently as well and are secreted in our body fluids.
This will help a you understand more about the biosynthesis pathways.
Hygiene is the main culprit. While pheromones are found in saliva and urine as well as sweat humans dont go around smelling other humans urine, butts or licking each other like other mammals do. That is what they are doing when you see a animal sniffing another animals butt or where they peed. They are picking up on information from the pheromones.
Anywhoo… while race age diet etc etc can effect the amount you make the only thing that effects the amount you have on your body is hygiene. Soap deodorant frequent showering tooth paste antiperspirant these effect whats naturally on the skin. How quickly you replenish them is probably different for everyone depending on the speed of metabolism. Men probably replenish faster then women though.