Where does the suffix -tine come from? For e.g., Ovaltine, Creatine, etc. all have a -tine suffix. What is the meaning connoted to the noun attached?
While Ovaltine is a brand (with an interesting history) of health drink, the supplement Creatine, technically isn't in itself a brand. It's the name of an amino acid which can help build muscle-mass. Furthermore, proteins are made up of combinations of amino acids. All these -tines and -ines lend an air of scientific reliability to brand names which like to tack them on at the end. That said, a number of these products do tend to be health-oriented and often actually are full of protein.
Etymonline provides the following explanation for the -ine suffix often seen in Chemistry:
chemical suffix, sometimes -in, though modern use distinguishes them; early 19c., from French -ine, from Latin -ina, fem. form of suffix used to form adjectives from nouns. In French commonly used to form words for derived substances, hence its extended use in chemistry.