Should Iodine Be Capitalized?

Elements are common nouns. So the answer is no, they are not capitalized.

Should chemical names be capitalized?

Chemical names

The names of chemicals are not capitalized unless they are the first word of a sentence. In such a case, the first letter of the syllabic portion is capitalized, not the descriptor or prefix. Note that prefixes such as Tris- and Bis- (which are not commonly italicized) are considered part of the name.

Should ingredients be capitalized?

After reviewing several recipe web sites created by corporate media groups and Internet startups, it is clear that, in general, recipe ingredients are not capitalized, but a few online style guides do say to capitalize the first letter of an ingredient name. ... But "scotch" as in "scotch whiskey" is often not capitalized.