Sentinel St. John's Wort 300mg is a dietary supplement containing 50 capsules of standardized St. John's Wort extract. Each capsule provides 300mg of this traditional herb that has been used to support emotional well-being and maintain a positive mood. St. John's Wort (Hypericum perforatum) is an herb that has been used for centuries in traditional medicine. The 300mg dosage is a common standardized amount used in supplements. As with any supplement that may affect mood and brain chemistry, it's important to consult with a healthcare provider before use, especially if taking any medications, as St. John's Wort can interact with various prescription drugs. This supplement should be stored in a cool, dry place away from direct sunlight.