Step-by-step explanation:
Mega means something that is large or big.
Therefore megadose simply means a very large dose of a vitamin or drug that is use to prevent or treat diseases.
Therefore Tommy s coach telling Tommy parents to purchase a certain B-complex vitamin he is selling to help improve Tommy energy was because Vitamin B contains a megadose or large amount of nutrients or vitamins that will help improve Tommy energy and give him more strength to play is soccer game. And Justine Tommy looking at the nutrient information and was surprised to see that it provided megadoses of a number of B was because he saw large amount of vitamin that will help give him more energy.