In addition, when an activity test was performed for several hours with HQ as a sole substrate in comparison to a control without enzyme, low activity was visually observed, even without the addition of H 2 O 2 or L-dopa, and a light brown color was detected after 3 hours of incubation (the control remained colorless)
Another thing I learned is that no matter our skin color, we all have the same number of melanocytes
However, the authors of these meta-analyses listed some limitations that open the way for carrying out more RCTs to answer questions: a small number of available trials and high heterogeneity between included studies 107
PubMed PMID: 22572575)
A recent Google Trends analysis revealed a significant increase in public interest in these drugs for off-label cosmetic use
Among common deficiencies are vitamins B12, D, A, C, folate, and minerals like iron, magnesium, calcium, and zinc