What's the difference between Calcium citrate and calcium carbonate

The difference between the two supplements include (a) the percentage of elemental calcium provided per 100mg, and (b) the way the body absorbs the supplement. Calcium carbonate is made up of 40% elemental calcium and 60% carbonate ingredient, so one 600mg tablet provides 240mg calcium. Calcium Citrate is made up of 20% elemental calcium and 80% citrate ingredient, so one 600mg tablet provides 120mg calcium. While you are technically getting more elemental calcium from a Calcium carbonate supplement, Calcium citrate supplements are absorbed more easily than calcium carbonate. They can be taken on an empty stomach and are also more readily absorbed by people who take acid-reducing heartburn medications.

What is the Expiration date?

the date should be on the bottle or box it comes in

is the bottle printed with "enter code for wellness rewards points... " right of the nature made brand in the green area? the amazon's picture has .

Some have the code for the points and some products don't have a code. Nature Made started a new program in May of 2015. and most of the codes now go for a chance to win something. Go to http://www.naturemade.com/ If you have an account there. sign in with your e mail and check the FAQ's There it will tell you all about the program. I haven't purchased any Nature Made products that had any code at all on them in over a year. Hope this helps you.

ASIN	B004B8JGUW
ASIN	B004B8JGUW
Additives	Vitamin D
Age Range Description	Teen, Adult
Allergen Information	Gluten Free
Brand	Nature Made
Country of origin	United States
Customer Reviews	4.7 4.7 out of 5 stars (5,338)
Customer reviews	4.7 4.7 out of 5 stars (5,338)
Date First Available	7 August 2012
Format	Tablet
Is Discontinued By Manufacturer	No
Item model number	2517
Manufacturer	Nature Made
Product Dimensions	6.2 x 6.2 x 11.13 cm; 223.96 g
Serving Recommendation	1 Tablet
Units	130 Count
Weight	130 Pounds

Nature Made Calcium 500 mg with Vitamin D3, Dietary Supplement for Bone Support, 130 Tablets

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