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This study evaluated the effect of a natural source of vitamin D 3 [1,25-(OH) 2 D 3 ] and capsaicin (CAP) in the dietary supplementation of sows in the final phase (85-114 days) of gestation (Gest) and lactation (Lact) on the reproductive performance of the sows and health of piglets through two experiments (Exp I and II). In Exp I, 120 sows were subjected to four treatments: T1-control (without [1,25-(OH) 2 D 3 ] and supplemental CAP); T2-3.5 µg 1,25-(OH) 2 D 3 /Gest/day and 7.0 µg Vit 1,25-(OH) 2 D 3 /Lact/day; T3-7.0 µg CAP/Gest/day and 14.0 µg CAP/Lact/day; T4-1.75 µg Vit 1,25-(OH) 2 D 3 + 3.5 µg CAP/Gest/day and 3.5 µg 1,25-(OH) 2 D 3 + 7.0 µg CAP/Lact/day. In Exp II, 200 sows were randomly blocked, factorial 2 × 2 (without or with Vit 1,25-(OH) 2 D 3 and without or with CAP): T1-control (without Vit 1,25-(OH) 2 D 3 and CAP); T2-3.5 µg Vit 1,25-(OH) 2 D 3 /Gest/day and 7.0 µg Vit 1,25-(OH) 2 D 3 /Lact/day; T3-7.0 µg CAP/Gest/day and 14.0 µg CAP/Lact/day; T4-3.5 µg Vit 1,25-(OH) 2 D 3 + 7 µg CAP/Gest/day; and 7.0 µg Vit 1,25-(OH) 2 D 3 + 14.0 µg CAP/Lact/day. The duration of delivery (3:48 vs. 4:57 h) and the percentage of stillbirths (5.37% vs. 7.61%) were improved ( p < 0.05) in the group that received Vit 1,25-(OH) 2 D 3 (Exp II) compared to the control group. Moreover, the dystocia rate decreased ( p < 0.05) in Exp II, which received Vit 1,25-(OH) 2 D 3 (4.21 vs. 27.63%), and in Exp I, which received the combination of Vit 1,25-(OH) 2 D 3 + CAP (12 vs. 40%) compared to the respective control groups. Colostrum production was greater ( p < 0.05) in sows that received Vit 1,25-(OH) 2 D 3 supplementation compared to the control group, consequently resulting in higher colostrum intake ( p < 0.05) of the piglets (330 vs. 258 g/piglet). The additives reduced the incidence of diarrhea ( p < 0.05) in piglets (Exp I and II). Thus, the use of additives improved the reproductive performance of sows and contributed to litter growth.