l carnitine or l arginine L-Arginine: A Science-Based Powerhouse for Muscle Growth and Performance L-Arginine supplement for men, Male

Y-box binding protein 1 (YB-1), another cold shock protein, plays roles in wound healing and immune cell recruitment to inflammation sites

Brass E

Other peptide drugs smooth fine lines, like Argireline, demonstrating that well-targeted peptides can penetrate to and work on specific cells

But as mentioned, there's evidence to show that high oral doses of vitamin B12 can be just as effective at treating a deficiency

There is an excellent presentation from Cambridge University which outlines this: [First trimester embryonic nutrition

A study found a 1.66-fold increase in CYP1A2 activity in smokers of 1120 cigarettes per day, which is reversed after smoking cessation (Tantcheva-Por et al., 1999)