How saffron can boost immune system?

How saffron can boost immune system?
The crocus plant is rich source of vitamins b, b1, b2, b6, c which are essentials in maintaining a healthy immune system, it also contains essentials oils and phytochemicals that strengthen the immune system and provide the body with antcarcinogenic elements, saffron- derived crocetin works as anti-cancer/ anti-tumor agent that inhibits growth of cancer cells and boosts the anti-oxidative system.