What can be done to strengthen your erection?

Supplements: Newer medications available to have this benefit. If you wish to approach it in a more natural method, i find a good product named "steel libido" from the health food store is effective as well and has less side effects than the medications. You still need to be cautious with these if you have heart disease, uncontrolled hypertension, diabetes. Be sure to check with your physician.

Live healthy: Like optmizing your weight, eating healthy, sleeping well, minimizing stress, remaining physically active, minimizing alcohol and tobacco use. You may also want to consider reviewing this with your doctor too, to make sure there isn't another more worrisome contributing factor.