Final answer:
Vitamin supplements are recommended for cancer prevention, metabolic defects that increase vitamin requirements, and specific vitamin deficiency diseases.
Step-by-step explanation:
Vitamin supplements are recommended in various scenarios. Firstly, they can be recommended for cancer prevention as certain vitamins have been shown to have antioxidant properties that may help reduce the risk of certain types of cancer. Secondly, they may be recommended for individuals with metabolic defects that increase their vitamin requirements, such as those with certain genetic disorders. Thirdly, specific vitamin supplements may be prescribed to treat vitamin deficiency diseases caused by a lack of certain vitamins. It is important to note that vitamin supplements are not recommended as a treatment for all cardiovascular diseases.
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