Best products from r/veganscience

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u/athlegan · 1 pointr/veganscience

Thanks for the feedback! Good stuff. 👍

First, let me be very clear that I'm not a professional nutritionist but just a happy amateur. So take everything from here on out with a big grain of salt.

You have a good point. Two things though:

  • Jack Norris writes that passive diffusion accounts for 1-3% of B12 absorption from food (referencing a book I haven't read).

    445.4 µg B12 above what IF can handle would then mean up to 20.7 µg B12 absorbed through diffusion (3 µg daily average).

  • I don't see anything in the study you cited that indicates any sort of cut-off point after 54.6 µg of B12 intake. Rather their equation shows there's a diminishing marginal absorption rate (ln(Ai) = 0.7694 * ln(Di) - 0.9614) which is to say that any microgram added is absorbed at a lower and lower percentage but the overall B12 absorption does go up.

    500 would mean: e ^ (0.7694 ln(500) - 0.9614) = 45.6 µg absorbed (6.5 µg daily average).

    I think the key part in their quote on maximum absorption is
    "amounts usually consumed with a meal"*. With supplements we've seen much higher levels of absorption than the 1.5 µg they talk about. More than 54.6 µg + passive diffusion can explain.
u/[deleted] · 3 pointsr/veganscience

This is my favorite blog about vegan nutrition, The Vegan RD. Here is a good intro post about what supplements you need as a vegan. According to her, the science on DHA is conflicting, but she supplements because it's probably a good idea. I personally don't because I eat a lot of flax seeds and canola oil. But if you're concerned about it, there are vegan sources of DHA (the fish get it from algae in the first place - the vegan version just goes straight to the source). DEVA makes some.

Creatine isn't essential... we can synthesize it. That Vegan RD blog I just linked has a lot of info about amino acids if you click around (hint - the answer is mostly to just eat a variety of legumes.)