Entire store is 15% off and now with this riddle you can have a code to get an extra 15% off your total.

I may be used for pulmonary arterial hypertension, who am I?

I relax the corpus cavernosum, who am I?

I am expressed in skeletal muscle, the prostate, the liver, the kidney, the pituitary gland, and the testes, who am I?

I may possibly save marriages, who am I?

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Yours

Ar-r