Can you increase penis size?

Until it's as big as: Until it's as big as it gets, a penis will gradually increase in size for 15-20 years. From one's late teen years, and for about 20 years after that, his penis will be about as big as it gets... only if he stays healthy. That means eating a natural healthy diet, avoiding drugs and alcohol, being healthy so not to need medications, staying happy and interested in relationships and sex, etc...

How big U want ?: You may want to talk with a urologist who "handles" such cases. S/he can give you a referral to a shrink if it an emotional issue or build you a larger one if you are ready for major surgery. By 23 you are done growing, but you can buy lots of things these days. The junk you read on line about vitamins/enlarger tools, etc. are just gimmicks.