My lady takes the same amount of VitC per dose (10-15grams) as I now do.
I daily average of 60grams, now 6x10 or 4x15 PREVIOUSLY 3x20
She only has 2 doses a day on an empty stomach. 2x10 or 2x15grams -- I make it, she drinks it.
She's 50, 5'3",50kg, doesn't drink but smokes, good diet(my opinion), strong active exerciser, good endurance abilities.
Me 45, 5'11", 75kg, dont smoke, dont drink, good diet but generally knackered C/- CFS-Chronic Fatigue Syndrome.
With CFS, exertion or over activity = delayed relapse into flu--often severe.
So it should be clear that she is the much healthier of the 2 of us.
Here's what surprises me, within an hour or so of taking my same size dose of VitC as she does I start to get belly rumbles then gas.
SHE--nothing-- You can safely stand/be close behind her and nothing, zip, zilch, no-methane to even put a match to.
Ok, so I take twice as much daily C compared to her but my gas is normally well finished before the next dose of C.
So then it could be assumed that maybe she really is secretly sick and her body is absorbing the majority of the C she takes and maybe I'm not as sick as what I believe?---
One thing for me -- no VitC = unrelenting bedridden/flu -- VitC DOES help me !!
On a better day if I use the C used (60grams)on a bad(normal) day then the gas is much worse leading to liquid stools.
So on those rare good days I use only 20 or so grams over 24 hours with the same amount of gas I would get on a bad day using 60grams/24hrs.
For me, it shows, sicker = more C needed.
BACK TO MY QUERY, I think some people(cast iron guts) aren't as sensitive to large doses of VitC and that their body either absorbs it or eliminates any excess without causing them bowel distress.
These type of people may then indeed require much larger amounts of Vit C for symptom relief than others.
I Think I've answered my query --- BOWEL TOLERANCE being the answer.
10 grams may fix some people where lots more may be required by the 'Cast Iron Guts Group'