Combining supplements is generally safe, but it's important to be aware of potential interactions and side effects. Taking multiple supplements at once can reduce the body's ability to absorb vitamins, and can increase the risk of harm. Keeping a log of your supplement intake can help you stay on track and ensure that you're not taking too much. Eating nutrient-rich foods is the best way to get vitamins and minerals, but supplements can be beneficial in certain situations.
It's important to talk to your healthcare provider before taking any supplements, especially if you have a health condition or are taking any medications.