Is the amount of Zinc in the tablets (30mg per day) too high?

The level of Zinc in our Acne Control Extra Strength Tablets has been designed based on current medical research on tolerance levels.

Please find following some upper limits stated in existing medical texts:

Signs of toxicity are: nausea, vomiting, diarrhea, fever and lethargy and have been observed after ingestion of 4–8 g zinc according to the 2002 WHO report. Single doses of 225–450 mg of zinc usually induce vomiting (King 2003).

Doses of zinc ranging from 100 to 150 mg/day (SkinB5 Tablets have 30mg/day which is much lower) interfere with copper metabolism and cause hypocuprinaemia, red blood cell microcytosis and neutropenia if used long term. - Herbs and Natural Supplements.  

Zinc is the least toxic trace mineral. Studies have confirmed that up to 10 times the RDA (150 mg) taken even overtime was not toxic. Doses this high are unnecessary and interfere with the assimilation of other trace minerals such as copper and iron. 

A maximum of 30mg a day of Zinc supplied by the skinB5 tablets are well below these limits.