24 grams is definitely a LOT. Enough to become a prooxidant, which is how it often works w/difficult cancer cases, and may be how it helped you.
One study found with intakes of about 20 g throughout a day plasma levels rise to about 9 mg/dl. Still very far from IV ascorbate plasma peaks.
Code:
Table 9.312 Human tissue & fluid ascorbic acid concentrations1
Organ/Tissue Vitamin C Concentration*
Pituitary Gland 40-50
Adrenal Gland 30-40
Eye Lens 25-31
Liver 10-16
Brain 13-15
Pancreas 10-15
Spleen 10-15
Kidneys 5-15
Lungs 7
Skeletal Muscle 3-4
Testes 3
Thyroid 2
Cerebrospinal Fluid 3.8
Plasma 0.4-1
Saliva 0.1-9.1
* mg/100 g wet tissue, mg/100 mL fluids
Which beside no such in-vivo finding, I find very unlikely.