Vitamine B12 non méthylée pour les corps sensibles
La Vitamine B 12 est essentielle à la santé du cerveau et du système nerveux puisqu'elle aide à former les globules rouges et l'ADN, et qu'elle fait partie d'importantes voies biologiques, connues sous le nom de cycles de méthylation. Cependant, les carences sont chose courante, particulièrement chez les personnes végétariennes, les adultes de 50 ans et plus, les personnes souffrant de malabsorption, d'anémie pernicieuse, de colite, de maladie cœliaque, de Crohn, du syndrome du côlon irritable ou d'autres types de troubles gastro-intestinaux. Une carence peut nuire de façon importante à la santé en général. Certains signes de carence incluent : fatigue, changements cognitifs, anémie mégoblastique, démence, dépression, troubles de l'humeur, sensibilité aux infections, troubles de l'équilibre et neuropathies périphériques telles que des engourdissements, fourmillements, tremblements. Plusieurs vitamines, incluant B12, ne sont pas biologiquement actives dans la forme retrouvée dans la nourriture et les suppléments; l'organisme doit donc convertir la vitamine dans sa forme coenzyme pour qu'elle puisse exercer ses fonctions biologiques. La forme conventionnelle de supplémentation de vitamine B12 est la cyanocobalamine, mais celle-ci requiert un processus de plusieurs étapes afin d'être convertie en adénosylcobalamine et méthylcobalamine, ses deux formes actives. L'hydroxocobalamine est une forme unique de vitamine B12 qui se convertit plus rapidement que la cyanocobalamine en adénosylcobalamine et en méthylcobalamine. Les deux formes actives ont chacune des fonctions différentes, mais importantes, dans l'organisme. En supplémentant avec la forme hydroxy, les gens peuvent assurer d'obtenir ce dont leurs corps à besoin en adénosylcobalamine et en méthylcobalamine.
Serving Size: 1 Lozenge
Amount Per Serving
% Daily Value
†Daily Value not established
Ingrédients non médicinaux: Xylitol, stéaryl fumarate de sodium, cellulose microcristalline, sirop de riz biologique, hyprolose et eau distillé.
Forms and Functions of B12Vitamin B12 (or cobalamin) is essential for the health of the brain and nervous system, and provides nerve and methylation support. Vitamin B12 deficiencies are particularly likely among vegetarians, adults over age 50, people with malabsorption or gastrointestinal disorders such as Celiac, Crohn’s, Colitis, IBS and those with pernicious anemia. One German study reported that only 5.3% of vegetarians meet the recommended intake of B12. The body uses vitamin B12 in the form of two different coenzymes, each of which plays a different role in the body. Adenosylcobalamin was discovered earlier and is the better-known of these coenzymes. Adenosylcobalamin helps the body to process some amino acids, and to form substances used in the body's energy cycle. The second coenzyme is methylcobalamin, which prevents the neurological and cognitive damage and dysfunction seen in B12 deficiency. While adenosylcobalamin is readily stored in the liver, methylcobalamin needs to be free to circulate in the body. Because of this, methylcobalamin doesn't hang around in the body for very long. Hydroxocobalamin and cyanocobalamin are two intermediate forms of cobalamin that are common in supplements. Hydroxocobalamin exhibits its own unique benefits, namely in regards to clearing toxins, and it is more readily converted into the active coenzyme forms of B12 than conventional cyanocobalamin. Understanding B12 DeficienciesVitamin B12 (or cobalamin) is essential for the health of the brain and nervous system, and provides nerve and methylation support. A deficiency can be profoundly detrimental to overall health. However, in order to understand how to best correct a deficiency we need to understand how to interpret lab values, and what the progression of a deficiency looks like. Testing for deficiency:While it is becoming less common to see a severe deficiency in North Americans, we tend to see more suboptimal levels in the population. Supplementing with only one form of vitamin B12 for all deficient cases can miss the mark. While it’s true that there is some degree of interconversion between the different active co-factor forms, and with hydroxycobalamin able to convert into both forms, we still see difficulty in correcting deficiencies when supplementing with the wrong form of B12. Depending on what lab value we use from testing we can learn a lot about which form is deficient. When cobalamin is transported in the body it is bound to a molecule forming holotranscobalamin. Testing holotranscobalamin levels gives an accurate reading of how much B12 is actually getting absorbed and delivered to cells. Another test looks at markers of enzymes that the B12 forms are involved in; For example, MMA, which we know is a by-product of the MMCoA mutase enzyme not working properly. Thus, increased levels of MMA would be more indicative of an adenosylcobalamin deficiency. ProgressionInterestingly, even though adenosylcobalamin was discovered earlier and is the better-known of these coenzymes, it is often not seen in supplemental form. This is likely due to the fact that it is stored in the liver and is more abundant within cells. Conversely, methylcobalamin is found mostly in the blood and, in times of deficiency (even mild deficiencies), is disproportionately depleted faster. A number of factors can lead to methylcobalamin deficiency including: genetic polymorphisms, dietary choices, and issues with absorption. This makes it harder for these individuals (also called “poor methylators”) to recycle homocysteine and to produce red blood cells. While supplementing with only methylcobalamin can improve these processes, the adenosylcobalamin pathways are often left under-supported. Hydoxycobalamin is the clinical standard for treating B12 deficiency. It is the most common form in doctor’s offices and clinics for injections, treating deficiency, and of as an antidote to cyanide poisoning. The reason being that it forms both adenosyl and methyl cobalamin. Thus when a B12 deficiency is clinically supported but not corroborated with lab tests- treatment with the precursor to both forms is safe and effective. This form is particularly effective in individuals who do not respond well to methylcobalamin forms ( hyper stimulated) as a result of their genertic polymporphisms. Hydroxocobalamin and Cyanide Exposure While many people significantly benefit from taking methylcobalamin, hydroxocobalamin offers unique benefits to individuals who may have been exposed to cyanide. Hydroxocobalamin helps the body to rid itself of cyanide by enhancing detoxification through its conversion of cyanide into the less toxic thiocyanate. In isolated human cells, hydroxocobalamin penetrates cyanide-laden cells and binds to cyanide directly. Hydroxocobalamin has a long history of use for such purposes (such as during industrial disasters) and is approved for this use in many European countries. At lower doses, oral hydroxocobalamin increases the urinary excretion of thiocyanate in laboratory animals fed cyanide-containing diets. Sublingual hydroxocobalamin, complexed with betacyclodextrin, is an ideal choice for a B12 supplement in persons concerned with chronic, low-level cyanide exposure. A study investigated the effects of administering hydroxocobalamin to firefighters who have suffered from hydrogen cyanide smoke inhalation, in order to determine if an early intervention with the administration of vitamin b12 coenzyme could have a positive effect. 161 firefighters who were suspected or confirmed to have hydrogen cyanide poisoning were studied in a multicenter retrospective case review from the Emergency Medical Assistance Unit (Service d’Aide Médical d’Urgence) in France. All patients were given an initial dose of 5 g of hydroxocobalamin. Non-responders received a second dose of 5 g of hydroxocobalamin. Of the patients that were initially in cardiac arrest, 30 died at the scene, 24 died in hospital, and 5 survived without cardiovascular sequelae. An improvement in cardiac disorders was noted with increasing doses of hydroxocobalamin. With higher dose administrations of the antidote, a superior outcome in patients with an initial cardiac arrest was observed. Methylation and Detoxification:Methylation is a key biochemical process essential for the proper function of almost all of your body’s systems. First, it acts as a factory to supply methyl (CH3) groups used for numerous reactions in the body. Some of these reactions are involved in the making of creatine, carnitine, coenzyme Q10, phosphatidylcholine, melatonin, and other important substances for the body. This process supplies methyl groups to be attached to DNA molecules in order to determine whether the blueprints in the DNA will be used to make certain proteins according to their patterns. Another function of methylation is to regulate the overall use of sulfur in the body. Sulfur is found in the diet in the form of the amino acids methionine and cysteine in protein. One of the most important sulfur-containing substances in the body is glutathione, our master antioxidant. The body’s detoxification system depends to a large extent on sulfur metabolism, therefore sub-optimal methylation also leads to toxin accumulation. The body stores much of these toxins (heavy metals, pesticides residues, etc.) in fat, but eventually, the accumulated toxins begin to cause problems throughout the biochemistry of the cells leading to premature aging, disease and immune malfunction problems such as increased homocysteine levels.The body’s methylation system is one of the most important biochemical processes for long-term health. If your body's methylation cycle is not working at an optimal level it will translate into many different health problems and will accelerate the aging process. The main key to activating the methylation cycle is to support the activity of the methionine synthase enzyme so that the partial blocks in the methylation process are lifted, and glutathione levels are brought back to normal. When this occurs, the body’s detoxification processes are supported and health is enhanced as a result of effective methylation.
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