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I was right! you can raise it just by taking Arachidonic Acid
No, sorry, you are mistaken. Look at the diagram you posted.
Alprostadil is PGE-1 (prostaglandin E-1). Arachidonic acid does not convert into PGE-1; some part of it converts into PGE-2, a completely separate compound. Believe me, you don't want to confuse the two. PGE-2 causes terrible nausea and vomiting, and as some people here can tell you, can be a miserable compound to inject.
PGE-1 is alprostadil (Caverject), the compound that the OP is asking about. It is injected into the corpus cavernosum of the penis to cause erections in men for whom the PDE-5 inhibitors like Cialis and Viagra don't work, or give them too many side effects.
Now, it would be more accurate to say that taking GLA (gamma linolenic acid, found in borage oil and evening primrose oil) might raise levels of PGE-1. However, any small amount of PGE-1 increased by taking GLA would never compare to the effect of injecting PGE-1 directly into the penis.
Again, look at the diagram you posted, and you will see that you are confusing PGE-1 with PGE-2. You never want to make that mistake in real life, trust me.