Hi momshie! You can find Vitamin D3 drops sa Watsons, Mercury Drug, and most major drugstores, they usually have different brands like Enfagrow, Blackmores, or generic ones depending sa budget mo. A few of us sa mommy group namin prefer ordering online sa Lazada or Shopee kasi mas maraming options at sometimes may sale, especially kung bulk bili para sa buong taon ng babies natin!