Yes it is safe to use and will enhance your immunity and improve your body functions but u cannot completely rely on it.
Best time to consume these juices is early morning, empty stomach.
Next Steps
Fix the timings of your food.
Avoid chilled foods.
Avoid spicy and hot foods.
No preservatives, no processed foods so that your stomach can rest and recover.
Health Tips
Try having lots of water and salad to keep yourself hydrated and healthy. For further queries feel free to contact me.