|Barked: Tue Jun 26, '12 11:33pm PST |
|Egg shell is about 97% calcium carbonate whereas bone is a network of not only calcium, but other minerals (phosphorus being a big part), collagen, and (in ones that apply), marrow, which contains fats and other nutrients.The elemental calcium content of eggshell is about 40% with hardly any phosphorus, whereas that in bone is is about 30% and contains a hefty amount of phosphorus, too. In other words, they're not equal from a nutritional standpoint. The processed nature of bone meal I can only imagine means compromised nutrition, but it's still better than eggshell if you insist on using a ground product.
The safety of bone meal is definitely a legitimate one -- many do contain high amounts of heavy metals like lead and are really not fit for food. If you rely on it as part of your diet plan, best to seek out another source. (I wonder why Solid Gold stopped offering it? Their product was a good one, IMO.) Look for FOOD GRADE bone meal. I used to work in a place that sold the NOW brand, and I'd trust them. Haven't heard of Kal.
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