There’s a word turning up on supplement labels that people ask me about fairly often. Methylated. It sounds technical, but what it means isn’t very obvious.
And the answer has less to do with the vitamin than with what your body does after you swallow it.
Most people know we can produce vitamin D from sunlight on our skin. The liver and kidneys finish the job. That’s two necessary conversion steps, neither of which you know happened.
Vitamin C is different. While most animals make their own- horses, cattle, dogs, cats, and more or less everything with fur: we can’t.
This is because the gene that makes the enzyme for the last step of the conversion doesn’t work in humans. Guinea pigs can’t either, which is why they’re the other species alongside us that gets scurvy.
So every bit of vitamin C you need has to arrive as part of your diet, either on your plate or via supplementation.
Then there are the animals that get vitamins from their gut instead. Horses, cattle, and rabbits, for example, all have gut bacteria that produce B vitamins and vitamin K in useful amounts, along with specialised gut systems designed to absorb them. We have similar bacteria doing similar work too, but the problem is that ours sit too far down the gut system to be as useful.
So the picture here isn’t that vitamins simply go in and get used. Some we make, some we can’t, some we’d make if we had the right equipment. And nearly all of them need converting once they arrive.
That conversion is the part people don’t think about.
A lot of vitamins turn up in a form your body can’t use directly. There’s a step that needs to happen first, sometimes several steps, before what you swallowed becomes something your cells can use.
The other thing people often don’t realise is that the amount you consume, and the amount your body ends up with, aren’t the same. The difference lies in the conversion.
Conversion depends on enzymes, and enzymes are made from instructions carried in your genes. Those instructions vary between people.
One of the better-studied examples of this variation involves folate, one of the B vitamins. Some people convert it efficiently. Others have a version of the gene that produces an enzyme that does the job less efficiently.
If you have the less efficient version, you won’t know it. There’s no symptom, nothing to notice. You eat the same greens as everyone else but end up with less of the usable form at the end of it.
A methylated vitamin has the conversion step already done. It arrives in the form your body uses, rather than the form your body has to work on first.
With folate and vitamin B12 in particular, it’s the difference between handing your cells a finished product, and handing them something they still have to assemble. For most people, either version gets there in the end.
For someone with less efficient conversion mechanisms, starting further along the chain makes rather more difference. The trouble is that you can’t tell which you are by how you feel so the methylated form is a sensible default.
I think this is the useful idea underneath all of it, and it isn’t really about vitamins.
Two people can take in exactly the same raw materials and end up somewhere different because the input is only half the story. The other half is their body doing something with it.
It’s the same reason I don’t give everyone the same schedule of care. Two people can walk in with similar-looking spines and respond at completely different rates, and you find that out by watching what happens rather than by assuming.
What suits you is decided by how you respond, not by what worked for the person before you.
Take care of yourself,
Tom
