We had great results with Goat Colostrum (Powder form from Mt Capra) and with raw Camel Colostrum (very expensive and rare).
We tried bovine (cow) colostrum with bad results (regression).
My son has Yeast overgrowth and bacterial overgrowth in his gut.
Colostrum treats leaky gut. I think it only works after being on gluten-free, sugar-free, yeast-free, dairy-free diet for quite a while. Yeast (Candida) can penetrate intestinal walls as well as bacteria making the gut "leaky". So, when the bad bacteria and yeast dies, the wall becomes "leaky". This is when colostrum helps to rebuilt the intestinal wall. Our intestinal wall is made of specific protein found in colostrum. When the wall is "destroyed" and has "holes", no matter how much probiotic you take, the good bacteria cannot attach to the intestinal wall to "recolonize" the gut. Colostrum helps rebuilt the wall creating space for the good bacteria to attach and regrow.
Colostrum is best to take together with probiotic in the morning 30 minutes before food, and again at night before bed.
In case with my son, he's been on a diet and Nystatin for 2 years, but he was getting more and more sensitive to different foods. I think his gut was getting more "leaky" because he was getting rid of yeast and bacteria. I also took colostrum and it worked for me too the same way. My food sensitivities got better.
After taking colostrum, my son gets spaced out for 2 hours, but then he gets much better. His speech gets better, he is happy, singing songs and using new words. His eye contact also gets better.
A huge boost was from Camel colostrum (raw, 5ml twice a day). The camel dairy dosen't have any more right now so we can't buy any more. But we're getting a similar effect that lasts (he is just getting better) with powder goat colostrum (Mt. Capra brand).
Your child might not be there yet (if he still has a lot of bad bacteria and no exposed walls), you might not see the same results right away. But colostrum is also good for all sorts of things. My son doesn't get colds, he has more energy, no running nose. I think colostrum helps get rid of bad strep bacteria in the gut as well.
Mt. Capra colostrum powder is a mix of dry colostrum and dry goat milk. I found that giving my son powder has mixed results. You never know how much colostrum was in that dose of goat milk powder. The colostrum itself is clear or white granules. I use a sieve to separate colostrum granules from goat cream. When I sift powder through a sieve, I only have colostrum granules left.
Then I use very sensitive weights to measure 10 mg of colostrum:https://www.amazon.com/gp/aw/d/B00ESHDG ... 1PIBKZ0_ri
We've started with 10 mg of colostrum powder 2 months ago and now he takes 35 mg twice a day. It's a huge boost for his speech. We stopped homeopathic remedies because they do the same thing as colostrum, and he can't take them at the same time.
Camel milk can also interfere with colostrum. If you give them together, you'll need to work out the appropriate dose. Too much will make your child cranky, too little won't have any effect.