The main components of colostrum are: Immune Factors consisting of immunoglobins, lactoferrins, oligosaccharides, cytokines, lactalbumin, and lysosomes Growth Factors consisting of mostly of IGF1 and smaller amounts of other growth hormones Nutritional Factors consisting of high protein concentrations (mostly whey protein, see below), lower lactose and lipid concentrations Overall, colostrum is lower in energy
hdl:2263/60716
Also, most supplements are well below the upper limit
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Since Vitamin B12 injections bypass the digestive system, its effects can be more potent than supplements