By Dr. Mercola

Unpasteurized grass-fed milk — Raw organic milk from grass-fed cows contains both beneficial fats and bacteria that boost your immune system. An outstanding source of vitamin A, zinc, and enzymes, raw organic milk is not associated with any of the health problems of pasteurized milk such as rheumatoid arthritis, skin rashes, diarrhea and cramps. Although raw milk availability is limited in the US, depending on where you live, you can locate the source closest to you at RealMilk.com.

Whey protein — Even if you don’t have access to raw milk, you can use a high-quality whey protein derived from the milk of grass-fed cows to receive much of the same health benefits. Whey protein contains beta-glucans and immunoglobulins, which protect your immune system and support your body’s natural detoxification processes.

Fermented foods — If you are serious about boosting your immunity, then adding traditionally fermented food is essential. One of the most healthful fermented foods is kefir — an ancient cultured, enzyme-rich food full of friendly microorganisms that balance your “inner ecosystem” and strengthen immunity. Besides kefir, other good fermented foods include natto, kimchee, miso, tempeh, pickles, sauerkraut, and olives.

Raw organic eggs from free-range chickens – Raw, free-range eggs made it to my 2008 list of the 10 Healthiest Foods Under $1, and they’re still an inexpensive and amazing source of high-quality nutrients that many people are deficient in, especially high-quality protein and fat. A single egg contains:

• Nine essential amino acids.
• Six grams of the highest quality protein you can put in your body. Proteins are nutrients that are essential to the building, maintenance and repair of your body tissues such as your skin, internal organs and muscles. They are also the major components of your immune system and hormones.
• Lutein and zeaxanthin (for your eyes).
• Choline for your brain, nervous- and cardiovascular systems.
• Naturally occurring  B12

And as long as you have a good source for fresh, organic eggs, you need not worry about salmonella if you choose to eat them raw. To find free-range pasture farms, try your local health food store, or go to http://www.eatwild.com or http://www.localharvest.org.

Grass-fed beef or organ meats — Grass-fed beef is very high in vitamins A, B12 and E, omega-3 fats, beta carotene, zinc and the potent immune system enhancer CLA (conjugated linoleic acid, a fatty acid). But don’t confuse “organic” with grass-fed, since many organically raised cows are still fed organic corn, which you don’t want. However, most grass-fed cows are raised organically.

Coconut oil — Besides being excellent for your thyroid and your metabolism, coconut oil is rich in lauric acid, which converts in your body to monolaurin – a compound also found in breast milk that strengthens a baby’s immunity.

Its medium chain fatty acids, or triglycerides (MCT’s) also impart a number of health benefits, including raising your body’s metabolism and fighting off pathogens such as viruses, bacteria and fungi. Additionally, a very exciting and recent discovery is that coconut oil may serve as a natural treatment for Alzheimer’s disease, as MCT’s are also a primary source of ketone bodies, which act as an alternate source of brain fuel that can help prevent the brain atrophy associated with dementia.

Make sure you choose an organic coconut oil that is unrefined, unbleached, made without heat processing or chemicals, and does not contain GM ingredients.

Berries — Blueberries and raspberries rate very high in antioxidant capacity compared to other fruits and vegetables. They are also lower in sugar than many other fruits. Other good ones include natural cranberries, which have five times the antioxidant content of broccoli, and have been found to decrease total cholesterol and LDL (bad cholesterol) levels in animal studies. Unsweetened cranberry juice has also been traditionally used to successfully treat urinary tract infections.

Broccoli – Broccoli is also on Green Planet’s list, and for good reason. This humble vegetable is indeed a superfood with near miraculous powers of healing and disease prevention. It contains the highest amount of isothiocyanates, a cancer-fighting compound, of all the crunchy vegetables. Isothiocynates work by turning on cancer-fighting genes and turning off others that feed the disease.

Other vegetables containing isothiocyanate include:

• Brussel sprouts
• cauliflower
• cabbage
• arugula
• watercress
• horseradish

Research has shown that eating cruciferous vegetables can significantly reduce your risk of breast, bladder, lung and prostate cancer. Best of all, you don’t need to eat massive amounts of these veggies to take advantage of their health benefits. Studies have shown that just 10 spears a week (5 servings) can make a difference in your health.

Chlorella – A superfood if there ever was one, chlorella is a single-cell freshwater algae that acts as an efficient detoxification agent by binding to toxins (most of which promote chronic inflammation), such as mercury, and carrying them out of your system. The chlorophyll in the chlorella helps you process more oxygen, cleanses your blood and promotes the growth and repair of your tissues. (For more information, please see my interview with expert, Ginny Banks.)

Tea – As for beverages, clean pure water is a must for optimal health, but if you want another beverage, a good choice with added health benefits is high quality herbal teas.

Matcha tea is the most nutrient-rich green tea and comes in the form of a stone-ground powder, completely unfermented. The best Matcha comes from Japan and has up to 17 times the antioxidants of wild blueberries, and seven times more than dark chocolate. Tulsi is another tea loaded with antioxidants and other micronutrients that support immune function and heart health.

Read the entire article here: http://articles.mercola.com/sites/articles/archive/2011/01/31/15-superfoods-for-under-20-stocking-your-pantry-on-the-cheap.aspx