Yeah I would imagine your German supplier is quite good at what he does with checking that it is the right concentrate, I am presuming your Israel supplier has a much stronger concentrate of MMS.
You should not be making yourself sick, if you are getting sick you are overdosing yourself, would also stick to the German suppliers MMS first.
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Nir check the MMS you have if it is 28% by doing and following this equation.
A 2oz bottle of MMS should have 16 grams of SC powered flakes diluted in the 2oz.
16 grams SC in 2oz (50ml) solution should weigh 60grams without the bottle giving you 28% concentrate solution of MMS.
Will not matter much if a gram or 2 are either way as long as you are close to this 28% the MMS should do the trick.
Thanks,
David