Vitamin E is an immune booster and has been shown to reduce the risk of upper respiratory infections, especially the common cold.

You have immune boosters for seasonal changes.

It's very unlikely that any Kalendru disease would affect a human being, and of course your immune booster is proof against such an event anyway.

His immune booster was handling the microorganisms.

I guess a lot of people could be killed before everybody in the Unity got immune boosters.

Proteins such as meats, milk, and fish also contain vitamin B12, a powerful immune booster.

To imply that immune boosters can prevent parasites is ludicrous.

Take these immune boosters on your tip to keep fueling your body's natural defense system.

Yellow onions are very good immune boosters, too.

On the other hand, ABs share the Type A preference for peanuts, which are powerful immune boosters.