what affect would taking 20 000mg of b12 at once have?
927390
B-12 doses are given as mcg, not mg.  It is water-soluble, which means that any excess becomes expensive urine.
47275
i think you might be eating too many vitamins that may contain b12, it's only found in meats, but ask your doc i'm not quite sure but it's fat soluable so it stores in your fat cells
682863
Vitamins B12 complex may help. Maybe you have a blood sugar problem....
387256
There are lots of B vitamins and they all are involved in different biochemical reactions.  Did you have a specific one in mind?
952563
It is extremely essential - you die without it. But it is NOT true that you only get it from meat! Dairy products and eggs are great sources - no need to worry if you include those in your diet. Strict vegans need to take yeast fortified with B12 or supplements.\n\nThere is, however, a condition called pernicious anemia that is fairly common, especially in older people, where you lose the ability to absorb B12 in your stomach. You can eat meat, take supplements, and still have a disabling lack of B12 in your system. In that case the B12 must be given in a way that bypasses the stomach, usually as injections, but one can also use tiny tablets that are absorbed under the tongue. There is no way to get enough B12 through your diet if you have this condition.
812538
B12 is reported to help with weight loss, but I have yet to see any credible studies on it.  You only need a few micrograms per day to get your recommended daily allowance.  If you are deficient in it, it could help but more than likely if you aren't iron deficient and aren't vegan you are getting plenty.  \n\nAs far as phen goes, I've seen it used as a stimulant / appetite supresant.  It's cousin, fen, has been linked to heart damage.  I would avoid it. You can read more at:  http://www.a1b2c3.com/drugs/fen01.htm\n\nThe sure way to lose weight is through a reasonable diet and fitness.  Short cuts rarely work and will ultimately set you back in terms of money from your pocket book and your health.\n\nGood luck.
868911
Yes, most everyone is in need of additional B-Complex.  \nBenefits - Strengthens nervous system\n                 Energy production\n                 Metabolism of fats, carbohydrates, & protein\n                 Healthy skin, hair, hormones\n                 Synthesis of DNA and new cells\n                 Healthy cardiovascular system\n                 Lowers homocysteine levels in blood\n                 Folic acid reduces risk of neural tube birth defects\n\nDepleted by:  stress, medications, sugar, caffeine\n\nDeficiency can cause nervousness, irritability, depression, and dementia.\n\nThe brand I use has a patented folic acid coating for better absorption and high potency biotin.\n\nHope this is useful and feel free to contact me with questions.
311598
I'm not sure that you can.  Have you seen a gastroenterologist about this?  I have a friend who was very sick from this & she had to moderate her diet & has to be very careful of what she eats.  My gastro was checking for this & found that my B-12 was deficient.
483030
I don't see B6 or B12 in NOX-CG3, which I find really helps with focus during workouts. I use BSN's N.O. Explode, which is essentially the same thing (competing product). I have noticed my endurance and strength substantially increasing. Definitely helps with recovery, not just after a workout, but even during sets. I give N.O supplements a thumbs up.
541028
Vitamin B12's primary functions are in the formation of red blood cells and the maintenence of a healthy nervous system. B12 is necessary for the rapid synthesis of DNA during cell division. This is especially important in tissues where cells are dividing rapidly, particularly the bone marrow tissues responsible for red blood cell formation. \n\nIf B12 deficiency occurs, DNA production is disrupted and abnormal cells called megaloblasts occur. This results in anaemia. Symptoms include excessive tiredness, breathlessness, listlessness, pallor, and poor resistance to infection. Other symptoms can include a smooth, sore tongue and menstrual disorders. Anaemia may also be due to folic acid deficiency, folic acid also being necessary for DNA synthesis. \n\nB12 is also important in maintaining the nervous system. Nerves are surrounded by an insulating fatty sheath comprised of a complex protein called myelin. B12 plays a vital role in the metabolism of fatty acids essential for the maintainence of myelin. Prolonged B12 deficiency can lead to nerve degeneration and irreversible neurological damage. \n\nWhen deficiency occurs, it is more commonly linked to a failure to effectively absorb B12 from the intestine rather than a dietary deficiency. Absorption of B12 requires the secretion from the cells lining the stomach of a glycoprotein, known as intrinsic factor. The B12-intrinsic factor complex is then absorbed in the ileum (part of the small intestine) in the presence of calcium. Certain people are unable to produce intrinsic factor and the subsequent pernicious anaemia is treated with injections of B12. \n\nVitamin B12 can be stored in small amounts by the body. Total body store is 2-5mg in adults. Around 80% of this is stored in the liver.
956951
Just make sure that you aren't taking the multivitamins with any medications unless you know for sure that the 2 won't react negatively with each other.\n\nHere's a website devoted to answering questions like this and more about multivitamins.
432977
Functions\nVitamin B12's primary functions are in the formation of red blood cells and the maintenence of a healthy nervous system. B12 is necessary for the rapid synthesis of DNA during cell division. This is especially important in tissues where cells are dividing rapidly, particularly the bone marrow tissues responsible for red blood cell formation. If B12 deficiency occurs, DNA production is disrupted and abnormal cells called megaloblasts occur. This results in anaemia. Symptoms include excessive tiredness, breathlessness, listlessness, pallor, and poor resistance to infection. Other symptoms can include a smooth, sore tongue and menstrual disorders. Anaemia may also be due to folic acid deficiency, folic acid also being necessary for DNA synthesis. \nB12 is also important in maintaining the nervous system. Nerves are surrounded by an insulating fatty sheath comprised of a complex protein called myelin. B12 plays a vital role in the metabolism of fatty acids essential for the maintainence of myelin. Prolonged B12 deficiency can lead to nerve degeneration and irreversible neurological damage. \n\nWhen deficiency occurs, it is more commonly linked to a failure to effectively absorb B12 from the intestine rather than a dietary deficiency. Absorption of B12 requires the secretion from the cells lining the stomach of a glycoprotein, known as intrinsic factor. The B12-intrinsic factor complex is then absorbed in the ileum (part of the small intestine) in the presence of calcium. Certain people are unable to produce intrinsic factor and the subsequent pernicious anaemia is treated with injections of B12. \n\nVitamin B12 can be stored in small amounts by the body. Total body store is 2-5mg in adults. Around 80% of this is stored in the liver. \n\nVitamin B12 is excreted in the bile and is effectively reabsorbed. This is known as enterohepatic circulation. The amount of B12 excreted in the bile can vary from 1 to 10ug (micrograms) a day. People on diets low in B12, including vegans and some vegetarians, may be obtaining more B12 from reabsorption than from dietary sources. Reabsorption is the reason it can take over 20 years for deficiency disease to develop in people changing to diets absent in B12. In comparison, if B12 deficiency is due to a failure in absorption it can take only 3 years for deficiency disease to occur. \n\nDietary Sources\nThe only reliable unfortified sources of vitamin B12 are meat, dairy products and eggs. There has been considerable research into possible plant food sources of B12. Fermented soya products, seaweeds and algae have all been proposed as possible sources of B12. However, analysis of fermented soya products, including tempeh, miso, shoyu and tamari, found no significant B12. \nSpirulina, an algae available as a dietary supplement in tablet form, and nori, a seaweed, have both appeared to contain significant amounts of B12 after analysis. However, it is thought that this is due to the presence of compounds structurally similar to B12, known as B12 analogues. These cannot be utilised to satisfy dietary needs. Assay methods used to detect B12 are unable to differentiate between B12 and it's analogues, Analysis of possible B12 sources may give false positive results due to the presence of these analogues. \n\nResearchers have suggested that supposed B12 supplements such as spirulina may in fact increase the risk of B12 deficiency disease, as the B12 analogues can compete with B12 and inhibit metabolism. \n\nThe current nutritional consensus is that no plant foods can be relied on as a safe source of vitamin B12. \n\nBacteria present in the large intestine are able to synthesise B12. In the past, it has been thought that the B12 produced by these colonic bacteria could be absorbed and utilised by humans. However, the bacteria produce B12 too far down the intestine for absorption to occur, B12 not being absorbed through the colon lining. \n\nHuman faeces can contain significant B12. A study h
527928
Vitamin B1 or thiamine enhances circulation and assists in blood formation, carbohydrate metabolism, and the production of hydrochloric acid, which is important for proper digestion.  \n\nA deficiency in this would be a disease called beriberi, which affects the nervous system.  This is usually rare in developed nations.\n\nSymptoms include constipation, fatigue, forgetfulness, labored breathing, loss of appetite, nervousness, numbness of hands and feet, pain and sensitivity, poor coordination, general weakness and severe weight loss.\n\nThe richest sources of B1 include brown rice, legumes, peanuts, peas, rice bran, wheat germ and whole grains.  If you are not a vegetarian, you can also find B1 in egg yolks, fish, liver, pork and poultry.
1107783
Unless you already have liver disease I doubt very much that this low dose would ever harm your liver. However, a simple blood test will tell you for sure.
852195
This is common in vegetarians... are you?  It could result in megaloblastic or pernicious anemia & neurological degeneration of neurons.  You probably have fewer than normal red blood cells, thus a reduced oxygen-carrying capacity.  You need to be taking supplements.
953968
If you take too much B12, you will lose what you don't need through urinating.  The only vitamins that can be dangerous to mega-dose on are A, D, E and K.  Those four vitamins are fat soluble, and do not leave your body when you take a mega-dose.  So, you are safe.
851323
Well, the B12 that they "add back" to cereal because they are processed, is a synthetic form that isn't as easily absorbed by the body...you would have to eat ALOT of cereal and thus probably gain weight and ruin your B vitamin balance...your best option is to go to the health store and buy METHYLCOBALAMIN...it is the ACTIVE form of B12 that will be the best absorbed by the body...I don't eat cereal...All cereals, including organic ones, go thru a machine that alters the natural grains, making them less nutrient dense and taking all the enzymes out so its harder to digest...then companies add synthetic vitamins back...only they don't add all the vitamins that naturally come with the grain.  Stick to whole grains like oats and quinoa.  And get that B12 supplement!