There is something biologically there
The results are inconclusive, but there are some promising results so far: In one small study with just 12 (healthy middle-aged non-smoker) subjects (taking either 500 or 1,000 mg per day liposomal glutathione for four weeks), there was a trend for increasing glutathione levels, although it only became significant in the 500 mg dose after two weeks, which was also the largest increase at 25%
doi: 10.1186/s12879-023-08783-y 184 CanasLSMolteniEDengJSudreCHMurrayBKerfootEet al
10.1007/BF02536034 49 PraticD., M
And what they found out was that in the, when they drew the blood, everything, all the glut that was in the plasma, which is not the blood cells, but the water part of the blood, it was there and nothing was in the blood cells
Consistent use for 3-6 months is needed to see noticeable hair regrowth