The Promise Serum by Keys Soulcare is a must-have for anyone seeking balance and hydration in their skincare routine. Keys, the reviewer, raves about the serum's ability to plump, hydrate, and leave the skin looking dewy. With just three to five drops, Keys applies the serum to the center of their face and gently presses it in, achieving a crystal-clear complexion. The serum's effectiveness is not limited to the face, as Keys also applies it to their neck, experiencing the same transformative results. The Promise Serum embodies the essence of embracing all possibilities, leaving the skin feeling nourished and ready to take on the day. Overall, this product is a game-changer for achieving healthy and radiant skin.