Groa
<Odlly enough, these purportedly ideal size dosages (250 mg) are kinda hard to find on shelves. Apparently the vitamin industry likes to sell people more than they need, but no harm done physically. I don’t know if this means taking a 1000 mg tab is the functional equivalent of just taking a 250 mg tab, but it may actually be the case.>
Usually I have recommended a range of 500 mg to 5000 mg, titrated to bowel tolerance, each individual is different. 250 mg is hard to find, and it is true the vitamin industry errs on the very high side for supplement dosages. 500 to 1000 mg are easier to locate, you can go with that which will be satisfactory.
< Vit C is also rumored to leach calcium out of the system in high dosages, to what extent nutritionists never seem to agree. To further complicate the matter, taking calcium and vitamin C together has been said to interfere with the absorbtion of C.>
I personally am not aware of a deleterious side effect of leaching Ca, ascorbate is also sold as calcium ascorbate if you are concerned with this, however my feel is that this is not a significant concern.
<Merlin, now that you are back, I would really apppreciate some input on these matters if you have it. I take supplemental C (250 mg or a 1/2 cracked 500 mg) when under physical stress or have a cold, but never with a calcium tab or high calcium foods. How much C do you think folks are REALLY getting regardless of the dosages eaten?>
Again, in my work I have recommended 500 to 5000 mg, ascorbate is absorbed in the upper part of the intestines by simple diffusion or active transport, therefore Ca may compete with the active transport but not the diffusion.
<I haven’t a clue anymore so I generally eat less supp C and tend to eat alot of C foods (fruit, veg) and often wonder if absortion/bioavailibilty is actually greater from a real food source…or is it like the vitamin A thing in spinich? Again, any comments of clarification on these issues greatly appreciated. >
Vitamin C is easily absorbed, bioavailability would not be a concern as it may be with other nutrients.
I hope this is of some help.
Merlin