www.chewy.com/source-original-dry-meal-formula-skin/dp/241210

Seaweed supplement manufacturer Wachter’s unfortunately went out of business. It was a fantastic company with the best standards but it went under after Covid.

Source makes a great product also and it’s something to consider for animals with the threat of nuclear war. The iodine content can perhaps provide some protection, at least for the thyroid.

They make a supplement in pill form for humans as well. It’s pure seaweed.