Your immune system is already very strong and can keep you healthy. In some people they have a low immune system and need drugs to help protect them. Also, sometime we have to reduce our immune system with drugs.
For an average person though, your immune system is more than adequate.
As people age their immune system decreases in efficiency. Some groups are developing drugs to increase the immune system in aging people by stimulating activity in the thymus, an important organ for immunity.
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