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Taking multivitamins means shit: most of it are in unabsorbable forms and unless you have severe nutrient deficiencies they will do jack shit.

Change your diet do a more ancestral/paleo one. There are indicators that the gut microbiome is a important factor in this: as you moved away from you parents you probably started eating different foods which further destroyed your body/gut.

Eg read Weston Price's book Nutrition and Phyical Degeneration for a clear example of what the modern diet did to us (and you).