Hi i am 19 year old and i am a healthy person my question is that is it safe to take hair nail skin tablets. i have no medical history currently not using any medication?

Safe= usually, worthwhile=likely not. Unless you are allergic to one of the components in the product it is as safe as any common food product. The content is usually just collagen or the proteins that make it which are present in a well balanced diet anyway. If your diet is lacking in the components it may help, if not it likely will not but would not harm you.

Why do you want to take these? The only benefit you will get would be a lighter wallet For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV, Flu and Covid vaccines. Wish you good health!