Multivitamin or single vitamin and do I need vitamins, this question is a big debate. If you eat a healthy diet so probably don’t need vitamins unless you have a vitamin deficiency. Symptoms of vitamin deficiency include brittle hair and nails, mouth ulcers, hair loss, scaly skin patches, and more. Recognizing these signs can help you adjust your diet accordingly. You should talk with your doctor to properly diagnose which vitamins you have a deficiency.
While you are at your doctor ask for a hair sample to test your micro nutrients. Micronutrients are vitamins and minerals needed by the body in very small amounts.
Back to the question about vitamins, multivitamins can have side effects Most studies find no benefit from multivitamins in protecting the brain or heart.
I myself take B12 but I eat a vegan diet high vegetables. Diet is a crucial factor for vitamins and minerals. I conclusion if you eat a healthy diet generally you don’t need vitamins for your exercise lifestyle.
( My opinion is if a doctor has you on a vitamin keep taking it, but a healthy balanced diet is the best way which if you are exercising diet is very important. )