Vitamins yield no energy nor provide unusual level of well being.

Its rare for anyone to need higher level of vitamins behind the RDA  to maintain health.

Crop can’t grow in depleted soil,  if a nutriment will be low the yield will be low but  the vitamin content will be normal.

Synthetic vitamins are identical to natural.

Vitamin C does not protect  from cold.

The more Vitamins not the better.

You can get enough vitamins from the food you eat.

Vitamin supplements are not needed to protect against harmfull chemicals/ pollution.