It is not in any medicine, not in any course, it does not come by listening to someone, it does not come from any shortcut.
It is already with you, and you are flushing it again and again, and you have to stop wasting and flushing it again and again
3 functions of Semen
1. Creation - Semen and its accompanying life force can be used to create another living being aka procreation
2. Creativity - Semen and it's accompanying life force can be transmuted and rechanneled to create new inventions, discoveries, arts, science etc in material and spiritual plane
3. Regeneration - Semen when retained gets reabsorbed which goes on to nourish/ repair/ regenerate cells, tissues, blood, organs etc
modern science is yet to fully understand unfortunately 2) and 3) as they are not measurable.