Golden Silk Bird's Nest With Collagen (Less Sugar) is prepared by using a very high-quality genuine cave bird's nest and rock sugar. It can be consumed directly from the bottle chilled or warmed. Ideal health tonic for young and old. This product is capped using vapor vacuum sealing, followed by sterilizing at high pressure and temperature. .No added coloring .No preservatives .No stabilizer Consume within 24 hours of opening, and keep refrigerated once opened.