Exact ratio of sodium benzoate for medicine preparation ?

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Jos Wielders

Ratio or concentration, what do you mean.

I think that the max concentration is dependant on the use, how much is taken per day and for how many days.

Read Article Potential Safety Issues Surrounding the Use of Benzoate Preservatives

and https://www.drugs.com/inactive/sodium-benzoate-242.html

Packiaraj Jeyachandran Manohari

Find out the minimum concentration of Sodium Benzoate by trying various concentration and evaluate the Preservative Efficacy / Microbial Limit Test of herbal preparation with sodium benzoate.

Phil Geis

What is pH of the herbal suspension? NaBenzoate/Benzoic acid is GRAS. Concerns Jos observes above are theoretical and not supported by practical data.

https://www.fda.gov/food/chemicals/questions-and-answers-occurrence-benzene-soft-drinks-and-other-beverages