It’s an immune system booster because of so many healthy benefits. I have listed just a few from each Ingredient used But there many other benefits.

Lemon Benefits

1. Aids in Digestion
2. Promotes Weight Loss
3. Encourages Liver Detox
4. Boosts Immune Function(filled with vitamin C)

Red Bell peppers Are excellent source of 
1. vitamin A, 
2. vitamin C
3. potassium

Garlic Benefits
1. Boost immune system
2. Reduces blood pressure
3. Reduced bad cholesterol levels

Ginger benefits
1. Helps in  Infections
2. Fewer Stomach Ulcers
3. Indigestion
4. Lowers Cholesterol
5. Improves Digestion
6. Controls Blood Sugar Levels

Disclaimer:Always consult your doctor for expert advise.