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Immunity - the resistance of the human body to foreign substances. It protects the cells of the immune system of the skin and mucous membranes of humans. Immunity is acquired by or for a certain time, or congenital. Immunity protects our body against various bacteria and viruses. If the body appeared alien cells, it begins with them at once to fight. But in any case, if the immune system is strong, it can be weakened. The first sign of the weakening of immunity - a tiredness of the body, or sleep disturbance. The second sign - is the presence of sores, and various infections that do not pass by. The third sign is already chronic. In any case, when the weakened immune system. It needs to be strengthened and receive a package of measures. You can buy immune system medicines online at medicinesdelivery.com