Heapsreal
These things contain probiotics.
Colostrum is made so that the calf gets its immunity up and running.
It contains a number of things such as lauric acid/monolaurin (which by itself stimulates the immunity)
and vitamin D binding protein which is the precursor of GcMAF.
The assay of GcMAF is not easy and so the actual presence has not been confirmed as far as i know.
But it is said that the GcMAF does come from the colostrum, with some people saying that it is the bacteria producing the GcMAF (i may have some more info some where)
I have thought about this a bit , maybe put in a thread here.
Somebody in Brisbane, who shall be nameless, started on colostrum. This person he used the full dose and then cut it down a bit. He herxed a lot. This GcMAF thing can be very very potent. He may have been using say 10-20-50 x the dose needed.
The thing is with GcMAF and the MAFs the dose Versus effect is not linear, So doubling the dose can give maybe 10-50 the herxing OUCH!!
So this person may have given his immune system a super Boost & over herxed. (hint) I dont know.
Here is a paper on a digested milk preparation which is interesting.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2667481/
This whole area is open for further developments.
Cheers GcMAF