This study was conducted to determine the effects of supplementing aged garlic extract (AGE) and humates with probiotics (HWP) at varying growth stages on the performance and carcass traits of broilers. The experimental study used 4x4 factorial in Completely Randomized Design, where the type of feed supplement as factor A (negative control, with AGE, with HWP, and positive control or antibacterial) and growth stage as factor B (brooder stage/0-12 d, starter stage/13-21 d, grower stage/22-28 d, and brooder to grower stages/0-28 d). A total of 320 male day-old Cobb broiler chicks were randomly distributed to 16 groups with four replicates. The supplements were given at 1g/kg inclusion rate. Significant interaction effects were observed between feed supplements and growth stages in terms of bodyweight, ADG and FCE. Results indicated that supplementation with either aged garlic extract (AGE) or humates with probiotics (HWP) was best done continuously at 0-28 d of age (brooder to grower stages). Supplementation with AGE or HWP at any stage of growth had no significant effect on carcass traits.