A great, cheap health-booster I've also been using is apple cider vinegar. It's full of vitamins, antioxidants and minerals, and can be used topically to treat mosquito or wasp bites, or as shampoo to make your hair stronger and shinier. If you put 3 tbs of it into a cup of water and drink it in the morning 15 minutes before having breakfast for a few days, it will detox you, cure just about any stomach problems as well as asthma, migraine, high blood pressure, arthritis, reduces the acidity of your body (despite being acidic itself, it turns alkaline during digestion), helps prevent cancer, cleans your veins and makes you feel more energetic. It also reduces hunger, so it will help if you're trying to lose weight or remain fit.
If you don't want to drink it, you can use it as an ingredient to certain salads and chutneys as well.