I answered this yesterday, but the post didn't post
I looked at the info on this online. From what I saw, this wouldn't be a good choice for your brother. Here's why.
Calcium is a mineral. There is no good or bad calcium, except possibly some oyster shell calcium due to possible lead content. That means, the calcium you get in a health food store is no more effective than Tums. The difference is in how you tolerate it and what form you prefer to take. Of course, the difference to the retailer is price. But we know, price doesn't dictate effectiveness.
The pills are 800 mg each of calcium. The dosage is 2 a day to equal 1600 mg. However, the body will only absorb 500-600 at a time. He would be consuming 1000-1200 mg each day. While that is adequate, I believe the label is misleading.
Also I noticed there is no Vit D in this calcium. The recommended daily amount of Vit D is now at 2000 IU. The Vit D is what sends the calcium to the bones. Without it, you don't get the maximum absorption from your calcium. They promote a lot of other "add-on's" for absorption, but leave out the main one!
And....I didn't see any USP symbol on the label. That's important to show that what's stated as being in the bottle/pill really IS in the bottle/pill. Otherwise, it's a grab bag of who-knows-what.
So, what I'd do for my brother is get a name brand or generic of that name brand calcium citrate (like Citracal) with magnesium and Vit D. Take 2 following lunch and 2 following supper. That should cover him.