Centrum should not hurt you even though you are 23, because its just a vitiman, it just has more of the vitimins that older people need in their systems, such as calcium which older people need more of. Its like midol, even though it says for woman, it is nothing more than tylonal with a small amount of muscle relaxer added, there for it is completely safe for men too. As far as taking it as a food suplement. Thats not going to help you much. Vitimins are meant to assist people who are eating relativly healthy allready, not to replace whole meals. That is not to say you should take ten vitimines and say your good, so dont get me wrong there. Vitimines just surve a completely different purpose than what you are using them for and definetly dont prevent vitimine defficiencies. I know that as a fact, as I have celiac desease, and have to have blood tests ran every three monthes to cheek on my vitimines and menerals even though I do take vitimines and protein drinks along with my normal meals. I hope this helps.