When Dax Sheperd recently asked me about peptides in his popular Armchair Expert podcast, I gave him an overview without the details provided in this post
PLoS ONE 10 (11), e0142334
Patient selection depends on age, disease stage, fitness, and donor availability
I tend to recommend the complex because the B vitamins work in harmony with each other
Different techniques are used to ensure quality control of finalized preparation like HPLC (high performance liquid chromatography) or gas chromatography, spectrophotometry, UV detection, measurement of osmolality & pH etc
If your insurance plan covers the injection, you will only be responsible for the copay, deductible, or coinsurance