I haven't heard of NeNew GLow but there is a lot of research behind Nutrafol and I have seen promising results in my patients. Nutrafol contains vitamins A, C, D, and E, biotin, iodine, zinc, selenium and 1875 mg of “Synergen Complex plus” which contains hydrolyzed marine collagen type I & III, Sensoril ashwagandha, rhizome extract, full spectrum palm extract, astaxanthin and 480 mg “Nutrafol Blend” of l-lysine, l-methionine, l-cysteine, horsetail extract, Japanese knotweed root extract, black pepper fruit extract, capsicum extract. Meanwhile, Viviscal only contains vitamin C, niacin, biotin, calcium, iron, zinc, AminoMar Marine Complex, horsetail extract, and millet seed extract. Another nutraceutical is Skinade. It has a significant higher amount of hydrolyzed marine collagen, which has been shown to benefit skin and nails but there isn't much data on how it benefits hair. Overall, I recommend Nutrafol for hair loss. I hope this helps! (I am not affiliated with any of these companies but I published a paper reviewing nutraceuticals).