Adam J. Humphreys: H1 for the product page and use CSS for rem for font size. Use synonym alternate from title so you can rank for variations of the same word for the same product where possible. Great content with the word in there if possible but you don’t need to stuff once is enough assuming there’s a moderately decent write up.
Buth Main: What an ecommerce platform do you use? The practices depend on the ecommerce platform. Look at this site https://www.kosher4u.eu/ Can you find h1? Is using h1 important for SEO?
KOSHER4U.EUKosher4u - Europe`s Premier Online Kosher SupermarketKosher4u - Europe`s Premier Online Kosher Supermarket
Jaroslaw Pidburskyj: You can hide the H1 and still make it visible with the visitor not knowing it is there.