SeaBond is an alternative.
They don't say exactly what is in it however anywhere on the
web.
They DO state that it does not have zinc.
http://www.sea-bond.com/faq_text.html
It is made from kelp, a seaweed.
I wonder if it has natural iodine in it then? hmmmm?
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Weezie looking at petunias 8.25.2017
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