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Effects of elevated d-alpha (RRR)-tocopherol dosage in man.

1989; Center for Academic Publications Japan; Volume: 35; Issue: 2 Linguagem: Inglês

10.3177/jnsv.35.133

1881-7742

Makoto Kitagawa, Makoto MIND,

Vitamin K Research Studies

A study was conducted to investigate the effects of a megadosage of free RRR-alpha-tocopherol in healthy college student volunteers. Of 19 volunteers, 14 were given daily doses of 600 mg (900IU) of RRR-alpha-tocopherol for 12 weeks, and the remaining 5 were given identical placebo capsules. The investigation was performed by the singleblind method. Alpha-tocopherol levels were measured in plasma, red blood cells '(RBCs), platelets, leucocytes (WBCs), and buccal mucosal cells. Alpha-tocopherol in plasma, RBCs, and WBCs rose, reached a maximum level 4 weeks after commencement of administration, and then remained at a plateau, while platelet and buccal cell levels reached a maximum level after 12 weeks of administration. The maximum levels in all the subjects were 2.5 to 3 times the baseline values. During the study, there were no changes in laboratory values for thyroid, liver, or kidney functions, and coagulation activity (including the vitamin K-dependent Hepaplastin test and PIVKA-II) or immunoglobulin levels. Healthy status continued without any abnormal symptoms, and without any subjective complaints on the questionnaire. In the control group also, no changes occurred during the investigation. Gamma-tocopherol changes were measured in plasma and RBCs. As plasma and RBC tocopherol levels rose after administration, the isomer levels were suppressed in both plasma and RBCs.