I have been using zinc since Feb ( 10 months ) first, i started including Zinc Picolinate in my diet, had no problem with it and then switched to this form by Nu U which is 40mg of the Gluconnate form. The optinions differ from specialists about the best absorbed form. However, i had no difference from Picolinate and no issue with taking it or any side effects. I think this bottle is the best value for money here on iHerb for Zinc, almost a stock for a year and plus, its manufactured in UK. Zinc is essential for maintaining a good immune system.