when vitamin a-depleted rats were given 500 micrograms of r acetate , a naturally occurring mixture of 480 micrograms dr ester and 20 micrograms r ester or 500 micrograms dr acetate orally in corn oil , serum levels of all administered retinoids peaked between 3.5 and 5 h and then declined .
C0042839
vitamin a
C0035339
retinoids