The phrase "a good supplement" is correct and usable in written English.
It can be used when referring to something that enhances or adds value to another thing, often in the context of nutrition, education, or resources.
Example: "Taking a multivitamin can be a good supplement to your daily diet to ensure you receive all necessary nutrients."
Alternatives: "a beneficial addition" or "a valuable enhancement."
As one father said, regretfully, public school is a good supplement for home schooling.
Insect repellent: Except for children, repellent containing a small proportion of the chemical Deet is still recommended, though citronella oil (available cheaply from pharmacists) is a good supplement.
Tourism will probably never replace agriculture as the region's main economic engine Mr Luckett boasts that the Delta has "the richest soil this side of the River Nile"—but it makes a good supplement.
"Opposing Forces," a book-length dialogue between two dissidents—one Polish, Adam Michnik; the other Russian, Alexei Navalny is a good supplement to the best of the recent surveys: Ben Judah's "Fragile Empire," Peter Baker and Susan Glasser's "Kremlin Rising," and Arkady Ostrovsky's "The Invention of Russia".
It indicates that network-level coordination would be a good supplement of IC.
She found the crash course to be a good supplement to the learning-as-needed process.
As for Mr. Pickens, he thinks he has found a pretty good supplement to his day job of running two investment funds under the name BP Capital.
Our results suggest that a good nutritional supplement in RP may be a combination of lutein, vitamin A and multivitamin.
However, it has been shown to be a good feed supplement if added in the correct amounts.
Sleep, regular vitamins (where needed), good calcium/magnesium support in the form of eating a lot of greens (which are higher in calcium and magnesium than dairy products are) and a good mineral supplement restores adrenal function.
IMDb, from the Web site of the same name, Internet Movie Database, is another good supplement.
