of the essence, substantive, crucial, requisite, substantial, basic, important, all-important, necessary, requirement, more...

nonessential, unnecessary, dispensable, unimportant, extraneous

oils, nutrients, vitamins, minerals, more...

non, good, subjective, objective, several, dominant, pantothenic, cleanliness, criminal, pre, special

much needed,   deemed necessary,   a must,   important to,   key component,   central to,   don't miss,   kitchen staple,   desperately needed,   most useful