They are not a blunt instrument
While research on IGF-1 LR3 in humans remains limited, human preclinical data 2 and mechanistic studies offer valuable insight into its biological potential and safety profile
Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency
That is the science behind the serum she keeps reaching for
doi:10.1309/cvhkle2r4w68k2nq
However, they work only while you take them, do nothing to promote tissue repair, and carry risks of gastrointestinal, cardiovascular, and renal side effects with prolonged use