A winter season immunity boost best used preventatively, or can be drunk if you feel under the weather. Astragalus stimulates the immune system, fights disease, encourages vitality and longevity. Lemonbalm tones the entire system, regulates body temperature, is antibacterial and antiviral. Rosehips boosts circulation, reduces inflammation, prevents colds and flus (high in Vitamin C). Tulsi warms, moves stagnant energy, harmonizes the endocrine system, eases dryness and congestion.