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While our bodies absorb nutrients slowly though food, IV therapy provides rapid absorption of higher doses

The primary difference is half-life

Nature 549, 523527

3 In a study using the rd1 mouse RP model, a mixture of antioxidants including alpha-tocopherol, ascorbic acid, Mn(III)tetrakis(4-benzoic acid)porphyrin and alpha-lipoic acid improved biomarkers of oxidative stress (protein carbonyl adducts and acrolein staining) and partially preserved cone function

This is because their stomach acid drops with age

If severe or unusual symptoms occur, such as persistent pain or inflammation, a doctor should be consulted immediately