Or supplements may interact adversely with other drugs or worsen disorders.

Vitamins, minerals, and herbal supplements may interact with chemotherapy drugs or radiation treatments, blocking their effectiveness.

Some supplements may interact with other medication you may be taking or have dangerous side effects.

Some supplements can have side effects or can interact with medications you're already taking.

Remember that supplements may interact negatively with prescribed medications.

Many other supplements may interact with testosterone.

Herbal supplements can often have significant side effects, and can interact with prescription medications being taken concomitantly by the patient.

Some supplements may interact with medications.

Certain drugs and supplements may interact with caffeine.

It cautions, though, that some supplements may interact with medication.