B vitamins are commonly added to energy drinks, many of which have been marketed with large amounts of B vitamins with claims that this will cause the consumer to sail through your day without feeling jittery or tense.
Reluctance is hesitation or unwillingness to do something. When you really don't want to go out in the rain, this is an example of reluctance. reluctance. reluctance. The state of being reluctant; unwillingness. Physics A measure of the opposition to magnetic flux, analogous to electric resistance. reluctance.
(by extension) The principle of using the least resources or explanations to solve a problem. Great reluctance to spend money unnecessarily. 1776, Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations: Parsimony, and not industry, is the immediate cause of the increase of capital. Industry, indeed, provides the subject which parsimony accumulates.