ZINPRO zinc methionine complex. Dairy producers have been using ZINPRO zinc methionine for years to improve milk production and quality, lower somatic cell counts and improve hoof integrity. Summarized results from 10 lactation trials show that the addition of ZINPRO methionine resulted in 2.8 lbs. more milk per day and a 33.6% reduction in somatic cell count.  Test results based on feeding level s of 3.6 grams per head per day.