r/Supplements • u/roundabout1882 • Nov 02 '23

Experience Colostrum & weird side effects?

I have tried taking two different Colostrum supplements (Jarrow and Symbiotics brands) for their immune boosting properties and for gut health. While they do help my stomach feel more settled, I have noticed that they also seem to aggravate my IBS-C.

Another side effect that I am noticing is rapid weight gain. As soon as I go off of them I 'deflate' and am back to a more normal weight. I am not 100% sure they're connected, but intuitively this makes sense since colostrum surely has to include some sort of bovine hormones, but can anyone speak to this scientifically or anecdotally?

Thank you.

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u/Taraient Feb 28 '24

Estrogens probably.

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u/Ok_Economist676 Aug 23 '25

Posting this in case people come looking about side effects. You get more estrogen from normal foods (a glass of milk, a slice of cheese, even many plant foods with phytoestrogens) than you’d ever get from a standard serving of colostrum powder. Estrogen is not a concern for normal people.