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Effect of long-term bovine colostrum or placebo supplementation on IGF-1 levels using double-blind, parallel group, placebo-controlled, randomised protocols. a IGF-1 levels in subjects receiving 20 g per day for 4 weeks b IGF-1 levels in subjects receiving 20 g per day for 12 weeks. Individual results from each subject are shown. No statistically significant differences between placebo and colostrum were seen
