Deficiencies of glucosamine and chondroitin sulfate are rare, since they are manufactured by the body, and the key to increasing their production is consuming a healthy diet that contains meats, eggs, good fats, low carbs, no sugars, no processed foods
, etc. as well as improving digestion. Also see the candida diet
and the main candida article for details about the candida diet.
Also see information about healthy diets in Foods that Damage, Foods that Heal.