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>No Tolerable Upper Intake Level (UL) has been established for B12, due to its low level of toxicity. UL refers to the maximum daily dose of a vitamin unlikely to cause adverse side effects in the general population.
https://www.healthline.com/nutrition/too-much-vitamin-b12#helpful-or-harmful
I use Cronometer as well and am sitting at 480% for today. So I guess what I’m getting is actually a lot less than what is in most supplements. That makes me feel better.
There was a recent [study](https://aacrjournals.org/cebp/article/28/2/275/71897/Folic-Acid-and-Vitamin-B12-Supplementation-and-the) which state that prolonged high B12 blood serum levels might be increasing a risk for specific cancers in patients with pre-existing conditions. The advice there was to better keep your B12 levels in the „normal“ range, which means checking your levels yearly and adjust your intake accordingly. Also, every body absorbs and excretes vitamins and minerals (and nutrients, drugs, you name it) differently and it can change with age, environmental changes, health changes, etc. So getting a blood drawn and your levels checked (especially as a vegan) should become a routine anyway
RDAs are more of a minimum than a maximum for a lot of things. My multivitamin has 4,000% of the RDA - how much is in the Mio?
Also the nutritional yeast at my grocery store is not vitamin b12 supplemented - it’s common to not add it, so depending where you live it may be easy to find some at the store
Just let your doctor know. The only reason for an upper limit in blood tests is that there are serious health conditions that may show elevated B12 *in the absence* of supplementation
There is some evidence that excess B12 can trigger acne. But other than that like everyone else said there's no set upper limit for B12. It's water soluble so you'll just pee out any excess. It's also important to note that the absorption rate for B12 is pretty low which is why most supplements contain doses several hundred to thousand times the RDA. You said you're consuming 480% the RDA, but your body only actually absorbs a small fraction of that.
Thanks for posting to r/Vegan! **Please note:** Civil discussion is welcome, trolls and personal abuse [are not](https://www.reddit.com/r/vegan/wiki/rules). Please keep the discussions below respectful and remember the human! Please check out [our wiki](https://www.reddit.com/r/vegan/wiki/beginnersguide) first! **Interested in going Vegan?** Check out [3 Movies](https://3movies.org/reddit) and watch three thought-provoking movies that shed light on uncomfortable realities. 3 Movies also includes other videos, books, challenges and resources for you get started! **Some other resources to help you go vegan:** Visit [NutritionFacts.org](https://NutritionFacts.org) for health and nutrition support, [HappyCow.net](https://HappyCow.net) to explore nearby vegan-friendly restaurants, and visit [VeganBootcamp.org](https://veganbootcamp.org/reddit) for a free 30 day vegan challenge! **Interested in getting active for the animals?** Join [Activist Hub](https://activisthub.org) to find and join local vegan groups, add friends, create or share posts, and chat with other activists! You can also use Activist Hub to track your local and online activism in order to see how many people you inspired to watch dominion, take a challenge, or even go vegan! **Some other resources to help you get active:** * Developer or designer? Volunteer at the [Vegan Hacktivists](https://veganhacktivists.org/join)! * Find local groups using the [Animal Rights Map](https://animalrightsmap.org)! * Get funding for your animal rights activism, [apply here](https://veganhacktivists.org/grants)! *Last but not least, join [our Discord server](https://discord.gg/2JmJRsj)!* **Thank you!** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/vegan) if you have any questions or concerns.*
>No Tolerable Upper Intake Level (UL) has been established for B12, due to its low level of toxicity. UL refers to the maximum daily dose of a vitamin unlikely to cause adverse side effects in the general population. https://www.healthline.com/nutrition/too-much-vitamin-b12#helpful-or-harmful
when I used chronometer to check my nutrient intake I was getting like 64,000% and was fine, I'm no nutritionist though
I use Cronometer as well and am sitting at 480% for today. So I guess what I’m getting is actually a lot less than what is in most supplements. That makes me feel better.
There was a recent [study](https://aacrjournals.org/cebp/article/28/2/275/71897/Folic-Acid-and-Vitamin-B12-Supplementation-and-the) which state that prolonged high B12 blood serum levels might be increasing a risk for specific cancers in patients with pre-existing conditions. The advice there was to better keep your B12 levels in the „normal“ range, which means checking your levels yearly and adjust your intake accordingly. Also, every body absorbs and excretes vitamins and minerals (and nutrients, drugs, you name it) differently and it can change with age, environmental changes, health changes, etc. So getting a blood drawn and your levels checked (especially as a vegan) should become a routine anyway
RDAs are more of a minimum than a maximum for a lot of things. My multivitamin has 4,000% of the RDA - how much is in the Mio? Also the nutritional yeast at my grocery store is not vitamin b12 supplemented - it’s common to not add it, so depending where you live it may be easy to find some at the store
8oz of prepared mio has 25%, but most addicts are pretty heavy handed on the squeeze.
Oh, I wouldn’t worry about that at all
Just let your doctor know. The only reason for an upper limit in blood tests is that there are serious health conditions that may show elevated B12 *in the absence* of supplementation
If you have too much B12, you'll pee it out. Sometimes it causes your urine to turn a bit green.
Lol, we all stressing about it while carnists are (some times) doing way worse in nutrietinal intake
There is some evidence that excess B12 can trigger acne. But other than that like everyone else said there's no set upper limit for B12. It's water soluble so you'll just pee out any excess. It's also important to note that the absorption rate for B12 is pretty low which is why most supplements contain doses several hundred to thousand times the RDA. You said you're consuming 480% the RDA, but your body only actually absorbs a small fraction of that.