Avid Bioservices Inc (CDMO)

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I usually think of the cruciferous vegetables as being the easiest way to get sulfates in a healthy diet. Also garlic, onion, milk, cheese, eggs, & meats. You could actually get it by taking glucosamine sulfate as well.

Here's a link that might be helpful:
http://www.just-health.net/Foods-High-In-Sulfur.html