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I share the same thing had success with b12 5000mcg daily but with time it went down. I did this like three times,  stopped b12 for sometime and went back again for 3 times every time I get nice libido boost then goes away. However this time I didn’t get it.

I have to use cialis or viagra to preform desire not there but with a new girl it does get better . I feel it’s dopamine issue but not sure