Analysis: in English sentences, the word many is often used to modify countable nouns; The word much is often used to modify uncountable nouns. Vitamins is the plural form of vitamins and a countable noun, so many is used.

I. vitamins

1, meaning: n. vitamins. The plural form of the noun vitamin.

Second, the usage:

Vitamin, an English word, is mainly used as a noun, which means "[biochemical] vitamin; [Biochemical] vitamins ".

Most breakfast cereals are enriched with vitamins.

Most breakfast cereals are fortified with vitamins.

Second, many

1, meaning: adj. Many.

2. Usage:

When many is used as an adjective, it is followed by a plural noun, which means many identical people or things (but the number is not clear). When it is used as a subject, its predicate verb should be in the plural form. Often used in negative sentences.

Many can be used to emphasize more and can be modified by too, so, how, etc.

Many of these substances are innocuous.

Many substances here are harmless.

Many antonym:

few

I. Meaning:

Very few; A few; A few.

Pron. minority.

A small amount

Second, the usage:

Few, when used as a pronoun, means "few, few", and when used as the subject, the predicate verb must be in the plural form.

Only because, so because is equivalent to because, which means no; Something is equivalent some something, indicating affirmation.

We saw few students there.

We hardly saw any students there.