Inadequate consumption of dairy products can compromise development of peak bone mass in adolescent women. PURPOSE The primary purpose of this study was to examine the effects of increasing fluid milk on bone health in girls engaged in a resistance training program. METHODS Thirty-two girls (13 to 17 yrs) who habitually consumed less than 3 servings of fluid milk per day were matched and then randomly assigned into either a milk (MG; n = 16) or juice (JG; n = 16) supplementation group. Subjects consumed 236 mL (24 oz) per day of either 1% fluid milk or juice in addition to the their habitual diet. Both groups completed a 12-wk heavy-resistance training program (3 days/wk). Whole body and regional bone mineral density (BMD) and content (BMC) were assessed at 0, 6, and 12 wks. Data were analyzed using a 2x3 ANOVA with supplement group (MG and JG) and time (weeks 0, 6, and 12) as main effects. RESULTS There were significant interaction (group × time) effects for whole body BMD (P £ 0.05) and lumbar spine BMD (P £ 0.05). The MG group demonstrated a nearly two-fold greater increase than the JG in whole body BMD (DMG = +0.013 vs. DJG = +0.007 g/cm2) and the magnitude of difference was greater for spine BMD (DMG = +0.029 vs. DJG = −0.015 g/cm2). CONCLUSION These findings indicate that providing 3 additional servings of milk per day in adolescent girls engaged in a resistance training program has favorable effects on whole body BMD, especially in the lumbar spine region. Supported by the National Dairy Council, Rosemont, IL.