Calcium from Eggshells?

Hi again Jeff-- Here is some interesting and relavent
material to your question about the amount of calcium
in eggshell~

CONCEPTS OF EGGSHELL QUALITY By Dr. Gary D. Butcher and Dr.
Richard D. Miles*

THE EGGSHELL ITSELF Most good quality eggshells from
commercial layers contain approximately
2.2 grams of calcium in the form of calcium carbonate. About
95% of the dry eggshell is calcium carbonate weighing 5.5
grams. The average eggshell contains about 0.3%
phosphorous, 0.3% magnesium, and traces of sodium,
potassium, zinc, manganese, iron and copper. If the
calcium from the shell is removed, the organic matrix
material is left behind. This organic material has calcium
binding properties, and its organization during shell
formation influences the strength of the shell.

afn.orgflkman4.htmOpen ↗

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Here is info from a company that boasts about the
superiority of their product which uses eggshell as a
calcium source. Although I can't validate their claims I
suspect there may be truth in the sell.

Q. I read that eggshell calcium is the least bioavailable.
If this is true, why do we use eggshell calcium in our
calcium supplements?

R. Contrary to what you read, eggshell calcium is highly
bioavailable. And GNLD products have been formulated to
maximize bioavailability. We chose eggshell calcium
because it is a superior, organically-derived source of
calcium. It consistently provides a high degree of purity
in a form that tends to be more readily soluble to
improve absorption by the body.

Also, eggshell calcium is an excellent natural source of
calcium carbonate, which delivers the most calcium per unit
of weight of raw material.

It is important to know that bioavailability is not easily
measured. The testing is involved, expensive, and in the
case of radioactive measures, dangerous. GNLD uses both
disintegration and dissolution testing to calculate
bioavailability.

This approach, which employs rigorous, standardized USP
testing procedures, has been well correlated with
bioavailability. The disintegration and dissolution of all
GNLD's calcium products has been shown to exceed the USP
standard for dissolution time.

nasabb.comfact%20and%20faq%20minerals.htmOpen ↗

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Here is an eggshell-vinegar recipe from a Naturopath Doctor
(ND). This formula has been around for some time. The good
doctor doesn't say how much calcium is in the concoction.
But since it is "Natural" it must be good.

Dr. Christopher's Eggshell Formula Good source of calcium.

After breaking the clean eggshell open, be careful to pull
out the small membrane that lines the shell.=A0 (Best to use
eggs from free-roaming chickens...check at your local health
food store)=A0 This membrane is high in cholesterol and it
is wise to eliminate it.=A0

Dry the shells at room temperature or under 130 =B0F.=A0
When thoroughly dry, powder the shells in a blender, nut
mill or with a rolling pin.=A0 When the powder from one
dozen eggshells is ready and finely powdered, cover with one
pint of apple cider vinegar or one pint of lemon juice
(lemon juice will sour and spoil quicker than the apple
cider vinegar).=A0 Mix the eggshell powder and liquid in a
large container, because the chemical reaction will cause
the solution to foam.=A0 Allow this to set for several days.
Then strain and combine with honey and water (to taste).

For the adult, use two or more tablespoons (or add to
distilled water, tea or juice if desired) and for children
in proportion.=A0 Some people like to add a tablespoon of
honey for each tablespoon of the vinegar-calcium mix, as
this is a great help in adjusting the hydrochloric acid
balance in the body as well as feeding calcium to the system

lifebalm.compage.cgiOpen ↗

Jeff, you asked "how much 5% vinegar do I add? restated for
a "kitchen" approximation~

"Using the shell of one egg how much vinegar is needed?"

If the shell of one egg has about 2 grams elemental calcium

and a 5% vinegar has 5 grams acetic acid per 100 ml

and one Mole of calcium (40 grams) reacts with two Moles of
acetic acid (2=D760=3D120 grams) to produce the product
calcium acetate

and assuming all the calcium reacts with all the acid to
make a 100% yield of calcium acetate

(for one egg) 2 g Ca =D7 120/40 =3D 6 g acetic acid

6 g of acetic acid =D7 100/5 =3D 120 ml vinegar (5%
acetic acid)

120 ml ~ =8D=BD=A0cup =B1 0.01 cup

For ONE EGGSHELL you need ONE HALF CUP VINEGAR

Sub C=F8dex

Paul Massey (Sub C=F8dex) here.

I was hoping someone would come along and check my chemistry
in previous post.

Does one half cup vinegar for the shell of one egg sound
right? I wrote:

How much 5% vinegar is needed to dissolve the shell
from one egg?

If the shell of one egg has about 2 grams elemental calcium
and a 5% vinegar has 5 grams acetic acid per 100 ml

and one Mole of calcium (40 grams) reacts with two Moles of
acetic acid (2=D760=3D120 grams) to produce the product
calcium acetate

and assuming all the calcium reacts with all the acid to
make a 100% yield of calcium acetate

(for one egg) 2 g Ca =D7 120/40 =3D 6 g acetic acid 6 g of
acetic acid =D7 100/5 =3D 120 ml vinegar (5% acetic acid)

120 ml ~ =8D=BD=A0cup =B1 0.01 cup

For ONE EGGSHELL you need ONE HALF CUP VINEGAR

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Here is the latest revision of the calcium from vinegar and eggshell web
site:

community.webtv.netdoc0Open ↗

Another draft to be scheduled soon.

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The latest revision of "Eggshell Calcium"--

community-2.webtv.netdoc0Open ↗

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The latest revision of "Eggshell Calcium"--

community-2.webtv.netdoc0Open ↗

Sub C=F8dex