The key ingredient in the Medik8 C-Tetra Serum is Vitamin C (in the form of Tetrahexyldecyl Ascorbate) and Vitamin E
Pvet P et al
When using a standalone 60 mg vial, you would administer B12 as a separate injection
However, these symptoms can also result from the caloric deficit associated with significant weight loss, adjustment to dietary changes, or pre-existing hormonal imbalances that become more apparent during metabolic transition
Downstream effects (IGF-1 elevation, body composition changes, recovery markers) take 24 weeks to manifest because IGF-1 synthesis lags behind GH pulses
Blomberg J, Gottfries CG, Elfaitouri A, Rizwan M, Rosn A