Suggest three instances when a person needs vitamin supplements. Explain why he or she needs them . Please tell me in your own words not from google

I’m not studying health or anything, but here are some reasons I know people need vitamin supplements.
#1, they lack some vitamin. Personally, I lack Vitamin D, so I’m prescribed to take a vitamin for that.
#2, it supports those with weak bodies. Most seniors take vitamins for bone strength, because.. well, they’re elderly.
#3, making up for allergies or dietary restrictions. You might be vegan and that can take away a lot of protein or grains. Eating a vitamin supplement will help you get those vitamins that your body need. Also, you might be allergic to some things.

I’m pretty sure this answer might not be much help, but good luck!