Hip
Senior Member
- Messages
- 18,217
@skwag
One kilogram of B12 crystals would be a bit too much, if you were dividing the purchase between say a dozen people. Assuming a daily dose of 5 mg of B12 is taken by an individual, then buying 5 grams of B12 would last that person 1000 days (nearly 3 years).
If you got a dozen people interested in each buying 5 grams, that's a total purchase of 60 grams.
If you look here, you will see that some Chinese wholesalers have a minimum purchase quantity of just 1 gram, and others a minimum purchase quantity of 100 grams. Those would be the most suitable for small purchases. If you ask them, they may be able to supply the B12 in several individual packets of 5 grams each, which would make it easier to distribute to a group of people.
Note that B12 methylcobalamin is relatively stable under heating, but methylcobalamin is destroyed by light (photodecomposition). So you must store methylcobalamin in a completely opaque container, so that no light can get in.
I think the photodecomposition process occurs more quickly when methylcobalamin is dissolved in water, so you are better off storing it dry.
B12 methylcobalamin is reasonably stable under heating: this article mentions that: "In neutral media and in the absence of light, the carbon—cobalt bond in methylcobalamin is very stable to thermal breakdown, and the molecule can even stand heating to 100°C for 20 minutes."
Info on the Photodecomposition of B12 Methylcobalamin Under Light
The study: "Stability of high-dose methylcobalamin injection" found that in ampoules of injectable methylcobalamin (ie, methylcobalamin in aqueous solution) that were wrapped in aluminum foil to protect them from light, around 92% of the methylcobalamin was still present 6 months later. So in the absence of light, methylcobalamin is reasonably stable.
However, this study found that 50% of the methylcobalamin in the ampoules disintegrated after only 4 hours exposure to bright light of 1000 lux (which is about the light level you get at 1 meter from an ordinary 60 Watt incandescent light bulb).
In this study: Time-Resolved Spectroscopic Studies of B12 Coenzymes: The Photolysis of Methylcobalamin Is Wavelength Dependent they found that the photodecomposition of B12 methylcobalamin occurs at two wavelengths: the ultraviolet UVA wavelength of 400 nm, and the visible light wavelength of 520 nm.
The best way to work with methylcobalamin would be using a red photographic darkroom light, which should not affect the methylcobalamin. Short of that, keep the ambient light dim when working with methylcobalamin.
One kilogram of B12 crystals would be a bit too much, if you were dividing the purchase between say a dozen people. Assuming a daily dose of 5 mg of B12 is taken by an individual, then buying 5 grams of B12 would last that person 1000 days (nearly 3 years).
If you got a dozen people interested in each buying 5 grams, that's a total purchase of 60 grams.
If you look here, you will see that some Chinese wholesalers have a minimum purchase quantity of just 1 gram, and others a minimum purchase quantity of 100 grams. Those would be the most suitable for small purchases. If you ask them, they may be able to supply the B12 in several individual packets of 5 grams each, which would make it easier to distribute to a group of people.
Note that B12 methylcobalamin is relatively stable under heating, but methylcobalamin is destroyed by light (photodecomposition). So you must store methylcobalamin in a completely opaque container, so that no light can get in.
I think the photodecomposition process occurs more quickly when methylcobalamin is dissolved in water, so you are better off storing it dry.
B12 methylcobalamin is reasonably stable under heating: this article mentions that: "In neutral media and in the absence of light, the carbon—cobalt bond in methylcobalamin is very stable to thermal breakdown, and the molecule can even stand heating to 100°C for 20 minutes."
Info on the Photodecomposition of B12 Methylcobalamin Under Light
The study: "Stability of high-dose methylcobalamin injection" found that in ampoules of injectable methylcobalamin (ie, methylcobalamin in aqueous solution) that were wrapped in aluminum foil to protect them from light, around 92% of the methylcobalamin was still present 6 months later. So in the absence of light, methylcobalamin is reasonably stable.
However, this study found that 50% of the methylcobalamin in the ampoules disintegrated after only 4 hours exposure to bright light of 1000 lux (which is about the light level you get at 1 meter from an ordinary 60 Watt incandescent light bulb).
In this study: Time-Resolved Spectroscopic Studies of B12 Coenzymes: The Photolysis of Methylcobalamin Is Wavelength Dependent they found that the photodecomposition of B12 methylcobalamin occurs at two wavelengths: the ultraviolet UVA wavelength of 400 nm, and the visible light wavelength of 520 nm.
The best way to work with methylcobalamin would be using a red photographic darkroom light, which should not affect the methylcobalamin. Short of that, keep the ambient light dim when working with methylcobalamin.
Last edited: