Effect of five-year supplementation of vitamin C on serum vitamin C concentration and consumption of vegetables and fruits in middle-aged Japanese: a randomized controlled trial.
OBJECTIVE
This study was aimed at evaluating the effect of long-term vitamin C supplementation on serum and dietary vitamin C and identifying the factors associated with change in serum concentration.


METHODS
A total of 439 subjects with atrophic gastritis initially participated in a randomized clinical trial using vitamin C and beta-carotene to prevent gastric cancer. We originally randomized the participants into four treatment groups using a 2x2 factorial design, whereby 0 or 15 mg/day beta-carotene and 50 or 500 mg/day vitamin C were administered in a double-blind manner. The beta-carotene component was terminated early after a mean treatment duration of four months. Before and upon early termination of beta-carotene supplementation, 134 subjects dropped out this trial, while 120 and 124 subjects took the vitamin C supplement at either 50 mg or 500 mg daily for five years.


RESULTS
Changes in serum vitamin C were significantly higher in the high-dose group (38.5% increase, 95% CI = 27.0-49.9) than in the low-dose group (13.0% increase, 5.1-20.9) or in the dropout group (3.3% increase, -2.1-8.6) after five-year supplementation. The serum vitamin C at baseline was negatively associated with changes in serum vitamin C (p < 0.0001), while high-dose (p < 0.0001) and low-dose (p < 0.05) supplementation and female gender (p < 0.001) were positively associated. Dietary intake of vitamin C in the supplementation group was almost identical before and after five-year supplementation of vitamin C (2.31 mg/day decrease, 95% CI = -15.3-10.7), while a 17.7 mg/day decrease (95% CI = -44.2-8.86) was observed in the drop-out group.


CONCLUSIONS
Five-year vitamin C supplementation induces a remarkable increase in serum vitamin C concentration, and our intervention program appears to have no effect on dietary vitamin C intake.
Kim
Mi Kyung
MK
Epidemiology & Biostatistics Division, National Cancer Center Research Institute East, Chiba, Japan. stsugane@east.ncc.go.jp
Sasazuki
Shizuka
S
Sasaki
Satoshi
S
Okubo
Shunji
S
Hayashi
Masato
M
Tsugane
Shoichiro
S
D000328:Adult; D000368:Aged; D001205:Ascorbic Acid / Q000008:administration & dosage* / Q000009:adverse effects / Q000097:blood*; D004032:Diet; D004043:Dietary Fiber / Q000008:administration & dosage; D019587:Dietary Supplements; D004311:Double-Blind Method; D002149:Energy Intake; D005260:Female; D005638:Fruit; D005757:Gastritis, Atrophic / Q000150:complications; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010349:Patient Compliance; D013274:Stomach Neoplasms / Q000517:prevention & control; D011795:Surveys and Questionnaires; D014675:Vegetables; D019207:beta Carotene / Q000008:administration & dosage / Q000009:adverse effects
D004043:Dietary Fiber; D019207:beta Carotene; D001205:Ascorbic Acid