Format

Send to

Choose Destination
Am J Clin Nutr. 1999 May;69(5):937-43.

Effects of long-term intake of retinol on selected clinical and laboratory indexes.

Author information

1
University of Arizona Cancer Center and the Arizona Health Sciences Center, Tucson, USA. brenda.cartmel@yale.edu

Abstract

BACKGROUND:

Chemopreventive agents developed to be used in a moderate-risk but otherwise healthy population need to be both efficacious and to have minimal adverse effects.

OBJECTIVE:

The objective of this study was to evaluate the adverse effects of long-term retinol intake in a skin cancer chemoprevention trial in a large population at moderate risk for skin cancer.

DESIGN:

Participants (n = 2297) were randomly assigned to receive retinol [7576 retinol equivalents (RE), or 25000 IU] or a placebo daily. The adverse effects of retinol intake were studied by monitoring 14 clinical symptoms and laboratory indexes. The median follow-up time was 3.8 y.

RESULTS:

No adverse effects concerning the 14 symptoms were observed. Significant differences in alkaline phosphatase (P < 0.0001), triacylglycerol (P < 0.0001), cholesterol (P = 0.04), and HDL (P = 0.01) were observed over time between the 2 groups. After 49 mo of follow-up, alkaline phosphatase was 7% higher, triacylglycerol was 11% higher, cholesterol was 3% higher, and HDL was 1% lower in the retinol group than in the placebo group.

CONCLUSIONS:

Because a 1% increase in cholesterol concentrations has been reported to be associated with a 2% increase in coronary artery disease risk, long-term ingestion of 7576 RE vitamin A/d should be considered with caution. However, further studies are needed to confirm this finding.

PMID:
10232634
DOI:
10.1093/ajcn/69.5.937
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Silverchair Information Systems
Loading ...
Support Center