8 Signs Your Immune System Is Weak
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1. You Regularly Have a Cold:
Frequent colds, especially more than 5–8 per year, are a strong sign that your immune system may be weak. Studies show that people with lower immune markers, like reduced natural killer cell activity, are more likely to catch colds. Research also confirms that impaired T-cell function is strongly linked to repeated viral infections. If you find yourself catching colds more often than friends or family, it could be a sign your defenses need support.
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