All of this work requires energy, and Co-Q10 is a critical factor in energy production pathways. In both animal and human studies Co-Q10 has compensated for immune deficiencies caused by aging or disease. 7 Daily Co-Q10 doses range from 20 to 200 mg. I recommend 10 mg twice daily for maintenance, increasing to higher doses during an infection. Almost a dozen studies demonstrate vitamin A's ability to reduce the incidence and severity of infectious illnesses.
Vitamin A supports immunity by maintaining the integrity of the body's mucosal surfaces.
Mucous membranes such as those of the respiratory and gastrointestinal tracts act as natural barriers to pathogens. Vitamin A also improves antibody responses and increases white blood cell proliferation. Adding 10,000-15,000 IU per day of vitamin A, or 25,000 IU of mixed carotenoids, to a healthy diet can help boost immune response. Up to 100,000 IU per day can usually be taken safely on a short-term basis. In its retinol form, vitamin A has the potential to cause birth defects and liver toxicity.