The primary difference between the popular promotions of CHRT and compounded BHT involves BHT advocates' use of regular testing of blood or saliva-bound hormone levels, use of individualized compounding rather than standard doses, dosing to attain certain levels in the body rather than for symptom relief, and the use of hormones for purposes other than relief of menopausal symptoms. Proponents of compounded BHT have been criticized by many mainstream medical sources for making unsubstantiated claims about its effectiveness for a variety of purposes, and for promoting it as more safe and "natural" than CHRT.