Yoghurt - the health of your immune system can depend a lot on the health of your digestive system. If you've take antibiotics recently or don't consume a diet consisting of 100% organic foods then you will have antibiotics in your system which will kill all bacteria both good and bad. In order to replace the good bacteria eat probiotic yoghurt or take a probiotic supplement.
What to supplement
There are also immunity supplements containing propolis available here
Echinacea - well known for boosting the immune system. Can be taken in tablet form, as tea or as a tincture.
Drink a 'green juice' every day - you can choose from one of the following or use a mixture of them:
Chlorella - a nutrient-dense superfood that contains 60% protein, 18 amino acids (including all the essential amino acids), and various vitamins and minerals.
Spirulina - the richest beta carotene food, with a full spectrum of ten mixed carotenoids. About half are orange carotenes: alpha, beta and gamma and half are yellow xanthophylls. They work synergistically at different sites in our body to enhance antioxidant protection.
Wheatgrass - a complete source of vitamins, minerals and amino acids. It is rich in chlorophyll which has been proven to have a cleansing effect on the blood, which means that it can help your body rid of harmful toxins.
Mix your algae with a fruit juice, preferably freshly juiced but the ready made stuff is fine too!
Other things you can do to boost your immune system
Sleep - your body will perform better if it gets enough rest. Stress causes strain on the immune system so making sure you get enough sleep will enable it to function optimally.
Exercise - Getting your body moving and getting your blood flowing improves your overall health and helps to prevent illness
Get outside in the sun - your body uses
Vitamin D to fight off infection and one of the few ways it gets Vitamin D is through exposure to the sun so next time the sun shines get out there and enjoy it.