B12 is dietary only, but should be reasonably plentiful.
from what i know b12 gets to the most part destroyed in the stomach.
my grandfather had an episode of forgetfulness and paranoid delusions that were cured with some b12 injections only.
B12 is dietary only, but should be reasonably plentiful.
It is done in what I would consider a fairly safe way- one large breath full, then probably at least a minute of regular breathing before the next period without.
I don't think oxygen deprivation is likely to be a major issue since he is unlikely to be without fresh O2 intake for more than 60 sec or so, which is going to be less of a stress on the system than swimming the underwater laps I used to do regularly as part of training.
sertra said:My partner and I have been sharing a box or two of bulbs a week (so 5-10 bulbs each, ISI if it matters) for the past few months.