Because they are commonly treated as complementary
The beginner protocol (5 mg/week) is sufficient for metabolic improvement
News Release July 31, 2018 Best L-Tryptophan and 5-HTP Supplements Identified by ConsumerLab -- ConsumerLab Tests Strength and Purity of Supplements for Sleep and Mood White Plains, New York, July 31, 2018 L-tryptophan supplements are often promoted to improve sleep and 5-HTP supplements to help with depression
Additionally, metformin can also reduce body fat secondary to optimizing insulin, glucose and glycogen, thus decreasing blood sugar levels and increasing demand of fatty acids used for energy
Be sure to disclose this history at your initial consultation
Light exercise like a good, long walk combined with aggressive hydration can also help speed your recovery time along