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All skin whitening treatments carry some risks, but non-invasive options like vitamin C, niacinamide, and arbutin-based topicals are generally well-tolerated
After disintegration, the so-obtained cell extract (homogenate) was centrifuged (11000 g , 5 min, 4 C), and the liquid was transferred to new test tubes and were frozen and stored at 80 C for biochemical analyses
the first lab may measure and report a value of 220 pmol/l, and a different lab may measure and report 380 pmol/l, again in the same blood sample (!) There is day-to-day variation of serum B12
That process takes weeks to months, not days
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