I was wondering where the cow bones were sourced from and found in the Q&A that they are from New Zealand or Australia from grass fed, pasture raised cows, pesticide free, non GMO feed etc. I have heard this is important, as other MCHA products may have heavy metals if not sourced the same. Good quality product, as usual, from Pure Encapsulations. Thank you!Love that this is product is a gel capsule! Been turned off for years to taking calcium because of the gigantic, hard tablet form they came in. I like the idea that I take 1 of these pills twice a day to get my full 500mg. No problem with reflux from this product like I use to get from taking the gigantic, calcium tablets. I think the combination of gel capsule form and fact that dose in each capsule being smaller may be the reasons why.I love these! I am lactose intolerant and have stomach issues from calcium carbonate or citrate. So thankful to find an alternative that doesn’t bother my stomach! No bloating or stomach cramps. These have stopped my nighttime leg cramping and seem to be good for my teeth as well. Couldn’t be happier! I take one in am and one in pm. I love not having to take 2-3 at a time like other types of calcium pills.This is calcium and phosphorous, and other minerals, in the form of ground, bovine bone--which has more or less the same nutrional qualaties as our own bone, so it makes sensethat it would be the best supplement for supporting our own bones. Whereas other calcium supplements, especially those with considerable amounts of calcium carbonate, have proventoxic for me: this supplement feel quite healthy--and I believe that it provides other benefits aside from just providingextra minerals. From what I can tell, looking at the chemical analysis of bone, it contains phosporous in its alkaline form,as well as lots of stable oxgen--so it may provide some benefits towards alkalinity. Needless to say, its always best to get your nutrients in their more natural form--and what is more natural than bone.I really love this product, as it's the best way to take calcium. Equally importantly, I love that this calcium product does not have any magnesium included, or any other ingredients. Their other microcrystalline hydroxyapatite product has the magnesium in it, in the form of mag citrate which many people cannot tolerate including me, plus ascorbyl palmitate which I, and many others, cannot tolerate either. So this product is perfect for us. Thank you!Calcium supplementFast deliveryPure Encapsulations is a good brand made in the USA. I appreciate that, but because of that and the fact that they have eliminated a few chemical additives, they are now raising their prices beyond the average consumers budget. In addition to this, they are now adding chemical additives like Ascorbyl Palmatate and Citric Acid (both un-natural forms of vitamin C) which effects many people with Vitamin C intolerance.This form of calcium is a good form to take, but it is too expensive and the capsule size is too large and very hard to swallow plus one pill only contains 250mg. This is a small dose for such a large size pill. All in all, I will not purchase again.This rating is for the product only. This is a very high quality calcium product, perhaps the best there is. HOWEVER, I WILL NOT ORDER THIS FROM AMAZON AGAIN. THIS PRODUCT SHIPS FREE FOR AN ORDER OF $35.00 OR OVER, WITH A STATED 5 TO 8 BUSINESS DAY DELIVERY. IT TOOK 19 CALENDAR DAYS TO RECEIVE IT AND I HAVE BEEN WITHOUT THE CALCIUM FOR OVER A WEEK. TO MAKE MATTERS WORSE, ANOTHER ITEM THAT WAS ORDERED AT THE SAME TIME STILL HAS NOT BEEN RECEIVED. WHAT'S HAPPENING WITH AMAZON??? IF THIS HAPPENS AGAIN, NO MORE AMAZON FOR ME.