@2ndjourney My oncology team recommended or prescribed various supplements for specific side effects (biotin for skin and nails, D3 for brain fog... calcium, iron and potassium because of low levels in blood tests, etc).
Other supplements I've added from doing my own (careful) research. I make sure to list them on my medication chart so that the medical team can comment or advise if there are any contraindications or other issues with what I'm taking.
I also try to get the nutrients from my regular diet as much as possible. Salmon is great for D3 and the brain... wasn't a fan before, but have learned to love it!