By far, lactobacillus and garlic are the two best remedies with the most scientific evidence of effectiveness. Tea tree oil ranks second.
Lactobacillus found in yogurt and garlic can be inserted vaginally or taken by mouth. Tea tree oil can only be used vaginally as a douche. It is harmful to take essential oils interally.
Depending on how severe the yeast infection is, many cases can be treated with home and natural remedies. Severe or resistant cases will need prescription treatment while infrequent and mild yeast infections can be easily managed with home and natural remedies.