My blood vitamin D levels were a bit over the normal range so I cut my intake in 1/2 but taking these with my multivitaminUpdate: I cannot explain this. I ordered from a different company and got the same batch number but don't have the chalky and broken tablet problem with the new order. We'll have to pay attention to the seller... Original review....I have been taking these pills for the last 7 years. This is the first time I have ever got a batch that is chalky and have all these broken pieces. I don't know if they change the formula or if they forgot an ingredient. I will try another batch and if it's still this way they have lost a very regular customer.I was told by my doctor that I needed to start taking 1200 mg of calcium, so I bought some calcium not realizing there are different forms of calcium. The one I bought was calcium carbonate, which gave me stomach upset and constipation, so I switch to calcium citrate and . . . .what a difference! No stomach upset and no constipation. The only draw for me with this product is that it only comes in 250 mg caplets, so I have to take 5 a day. It would be nice to take two 600 mg a dayI put the entire bottle in grinder. Mix two tsps of calcium in water to make a paste. I put this on his raw food. If the dog does not get calcium from the bones of the food, the calcium leeches from its bones. So many people in the United States remain ignorant and cause the animal to suffer on purpose. Give your dog ample calcium in a paste. They needs a lot of calcium. If you pet gets osteoporosis it is your fault. Look at all the sick people in usa that choose not to invest in there health. Same goes for your dog. Give the dog calcium without D3.These tabs are larger than the original. But something else seems to have changed to compensate for that: at least the outer mass dissolves more quickly, so that in a couple of seconds or with a swish, it's ready to be swallowed at the same size as the older tabs. That saved it for me, otherwise it would be consigned to the heap of brick-sized caplets that we are expected swallow (and choke on).I like this calcium supplement because it doesn't have a bunch of additives and each tablet contains 19% of your daily requirement. I have a hard time swallowing pills sometimes, but I just take a sip of water and let these dissolve somewhat before swallowing. Douglas Labs makes some of the best supplements that I've tried.This is a great Calcium supplement for anyone with any auto-immune disease, but particularly for sarcoid. The administration of moderate to high doses of corticosteroids is associated with bone loss. Since Prednisone or other corticosteroids is the primary form of treatment for Sarcoid, it's important to get calcium. However, Sarcoid (and other auto-immune diseases) also makes your stomach so much more sensitive to so many supplements. Calcium Citrate is one of the most easily tolerated/digested forms of calcium. Most importantly, for someone with Sarcoid, it's important to avoid Vitamin D, as Sarcoid converts inactive Vitamin D to its active form.This is the single best calcium supplement I have found for someone with sarcoid. Actually, it is the ONLY calcium supplement I found to have been independently verified by a lab (Consumerlab.com) to contain exactly what it says, to not upset the stomach, and that does NOT contain Vitamin D. Unless they go changing things, this is the calcium supplement I will be taking for the rest of my life.Research recommends that this form of calcium supplement is more readily absorbed than some other sources. Shall have to wait for next bone density test to know if it has been of help with my osteoporosis. Calcium supplements should be taken with vitamin D because it allows the calcium to be absorbed. Some research recommends magnesium as well, but this is still in early stages of research. Anyone who wishes to take any supplement should consult with a physician, and be aware that there can be some unwanted drug interactions, but calcium (especially for women) is thought to be safe (not if you have kidney stones). Consumer's Lab is a legitimate and very useful site for information regarding vitamins and supplements, and they test products for safety and efficacy (consumer lab.com).