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Discover LudwigSuggestions(5)
The phrase "are a good source of" is correct and usable in written English.
It can be used when discussing the benefits or nutritional value of something, typically in the context of food or information.
Example: "Leafy greens are a good source of vitamins and minerals essential for a healthy diet."
Alternatives: "provide a valuable source of" or "are rich in".
Exact(60)
Milkmen are a good source of credit.
Careers fairs are a good source of willing listeners.
Lupins are a good source of protein, popular in livestock feed.
I suppose that the bones are a good source of calcium even though they're hollow.
Nuts are a good source of protein, and the fat in these foods promotes heart health.
Virginia bluebells bloom in early spring and are a good source of pollen, Dr. Chavarria said.
Potatoes are a good source of protein, starch, vitamins and nutrients like zinc and iron.
Twisted fairytales are a good source of humour (I've done it myself).
They are a good source of calcium, magnesium, phosphorous, potassium, iron, folate and protein.
Flowers that pollinate, for example, are a good source of food for many insects.
The flowers and seeds of ivy are nutritious, and are a good source of pollen.
More suggestions(17)
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are a good indicator of
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com