Why is my erection not as strong as it used to be?

Online Answer
Erectile dysfunction that comes on gradually often points to causes that involve blood flow or nerves. On the other hand, a sudden loss of sexual desire or the ability to have erections usually suggests that a medication or psychological difficulty, such as depression or stress, may be to blame.
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B12 deficiency may also cause impotence in men. B12 deficiency can result in erectile dysfunction (ED) because the nerves in the penis can become damaged making it impossible to achieve or maintain an erection..