How Florence Discovered What Was Draining Her Energy & Brain Fog
I've been vegan for 9 years. Last week I took the right B12 and felt like myself again for the first time since college.
Written by Florence J - Health Expert
Reading time: 3 minutes
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1. Fortified Foods Aren't Enough (And Never Were)
The Problem: You eat nutritional yeast on everything. You drink fortified soy milk. You check labels religiously.
But here's what nobody tells you: fortified foods don't contain nearly enough B12 to guarantee you'll keep your levels up.
The Reality: One serving of nutritional yeast? About 12% of your daily B12. Fortified soy milk? Maybe 50% per cup. A fortified energy drink? 250%... but only if your body actually absorbs it.
And that's the problem: even if you're eating fortified foods all day, every day, you're still gambling that you're getting enough AND that your body is absorbing it properly.
You're not. And the numbers prove it.
You need supplementation. Period.
2. Your Body Can't Absorb B12 From Pills (70% Gets Flushed Out)
Here's a fun fact nobody tells you when you're standing in the supplement aisle:
When you swallow a B12 pill, up to 70% of it gets destroyed in your stomach before your body can even touch it.
The rest? Your body struggles to absorb.
One vegan on Reddit put it bluntly: "TABLETS WONT WORK. TAKE B12 METHYLATED DROPS...MY PROBLEM SOLVED"
Another said: "If you are taking them daily but still have symptoms... they aren't working."
Your stomach acid is literally obliterating the supplement you just paid for. Then you pee out what's left.
This is why so many vegans say "I took B12 for months and felt nothing."
It's not that B12 doesn't work. It's that pills don't work.
3. By The Time You Feel It, You're Already Screwed
B12 deficiency doesn't announce itself.
It creeps. Slowly. Quietly.
Your liver stores B12 for 3-5 years, so you can go vegan, feel amazing, be thriving... and then suddenly, one day, your brain just stops working the way it used to.
You walk into a room and forget why you're there. You read the same paragraph three times. The words won't come out right in meetings.
One vegan described it as "swimming through maple syrup." Another said their cognitive abilities felt like they'd been "switched out for a stranger's."
And here's the brutal part: by the time you notice the fog, the forgetfulness, the mental slowdown, your brain and nerves have already been starving for months.
B12 builds the protective coating around your nerve cells. Without it, that coating breaks down. And once nerve damage happens, some of it can't be reversed.
Vegans who've been through severe deficiency all say the same thing: "Start supplementing from day one. If you get to the point you're deficient, you've already seriously fucked up."
Don't wait until you can't remember names. Don't wait until thinking feels like wading through mud.
Start now.
4. Your Doctor Doesn't Know What They're Looking For
You went in feeling exhausted. Anxious. Foggy. Like your brain is swimming through maple syrup.
They ran blood work.
"Your B12 looks normal," they said.
But you still feel terrible.
So what's going on?
Blood tests measure total B12 in your blood, not what your cells are actually using. You can have "normal" levels floating around while your brain and nerves are literally starving.
This is called functional insufficiency. And most doctors don't check for it because they don't know to look.
One vegan asked: "Why do I have B12 deficiency symptoms even though my blood test is normal?"
Another said: "Anything between 60-200 is an indication of a deficiency, but neither doctor mentioned this to me."
Your labs might say you're fine. Your body is telling you otherwise. Trust your body.
5. Your Brain Is Screaming And You're Ignoring It
Brain fog. Memory slipping. Trouble focusing. Anxiety spiking. Depression creeping in.
You think it's stress. Burnout. "Just being in your head too much."
It's not.
It's your brain literally running on fumes.
Listen to what vegans with severe deficiency describe:
"I feel hungry and exhausted all the time. At the same time, I have no appetite. I have paranoia that constantly messes with my head. It makes it hard to focus. My preexisting depression has gotten worse, as has my anxiety. I was told I'm at risk for psychosis."
Another said: "Exhausted all the time, headaches and my eyes have been extremely sensitive to light."
Here's what B12 actually does:
Produces neurotransmitters (serotonin, dopamine—the chemicals that regulate your mood)
Builds the protective coating around your nerves
Creates red blood cells that deliver oxygen to your brain
Without it? Your brain can't function.
Period.
This isn't about "optimizing." This is about basic function.
6. 40% Of People Can't Even Use Regular B12 (And You Might Be One Of Them)
Not all B12 is the same.
Most cheap supplements use cyanocobalamin a synthetic form that your body has to convert before it can use.
But here's the kicker: 40% of people have a genetic mutation (MTHFR) that makes this conversion nearly impossible.
So you're taking B12 every day. It's sitting in your system, useless, because your body literally can't activate it.
One vegan said: "I just this week found out I have a pretty severe MTHFR mutation... methylated b12 and folate changed everything for me."
Another: "The methylcobalamin is the naturally occurring B-12 and works in the body faster."
You need methylated B12 (methylcobalamin)—the form that's already active. No conversion needed. Works immediately.
Even if you don't have the gene mutation, methylated B12 is faster, more reliable, and actually gets used by your body.
Stop gambling on whether your genetics will cooperate.
7. Taking B12 Alone Is Like Trying To Start A Car With Half An Engine
Most vegans supplement B12 and call it a day.
But here's what nobody tells you:
B12 and folate work together in the same biological pathway.
Taking just B12 is like trying to clap with one hand. You're missing half the equation.
One vegan put it this way: "l-methylfolate can sometimes be needed in order to absorb b12 supplements at all."
Another said: "I was taking b12 for the last couple years with only slight helpfulness... then I added methylfolate and everything changed."
Your body needs both:
Methylated B12 (methylcobalamin) for nerve function, energy production, red blood cell formation
Methylated folate (5-MTHF) to complete the methylation cycle that supports brain function, mood, and cellular repair
Together, they work. Apart, you're getting half the benefit and wondering why you still feel like crap.
8. Every Week You Wait, Recovery Gets Harder
"I'll start supplementing eventually."
"I've been vegan for years and I feel fine."
"I can just eat more nooch."
Meanwhile, your B12 stores are draining. Your nerves are deteriorating. Your brain is struggling to keep up.
And the brutal truth? Some nerve damage from B12 deficiency is irreversible.
One vegan said: "I guess I need to take my B12 supplements more than once a month. I was just winging it 😆"
Another was more blunt: "All this could have been avoided if you simply took a supplement and went to the doctor 1x a year. A B12 deficiency is serious and life threatening. Irresponsible."
The vegans who've been through severe deficiency all say the same thing: "Take your freaking B12 supplements, people."
Don't wing it. Don't wait. Don't gamble with your brain.
The longer you delay, the more damage piles up. But if you catch it early? Full recovery is possible.
9. Real People, Real Results (What to Expect Week by Week)
This isn't a quick fix. It's not caffeine or a cheaply made stimulant that gives you instant energy and crashes you an hour later.
This is about restoring what your body has been missing—and that takes time.
Week 1-2: Some vegans notice subtle improvements in mental clarity. Others don't feel much yet, and that's completely normal. Your body is starting to absorb and use the nutrients, but B12 stores take time to rebuild.
Week 2-4: This is when most people report noticeable changes. Brain fog starts lifting. Focus becomes sharper. That constant mental exhaustion starts backing off. You stop walking into rooms and forgetting why you're there.
6-8+ Weeks: Brain fog typically improves significantly. Mental clarity stabilizes. You stop needing to re-read the same paragraph three times. The cognitive sluggishness that used to define your afternoons is gone.
Surveys show that the majority of vegans who address their B12 deficiency properly notice improved mental clarity, reduced brain fog, and more consistent cognitive function when they give their body the nutrients it actually needs, in forms it can actually use, delivered in a way that actually works.
This is what happens when you stop gambling on fortified foods and start giving your brain the fuel it's been starving for.
It's not magic. It's biology working the way it's supposed to.
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