On top of the Bellisso serum’s hair-thickening, loss-reducing, and reparative properties, it’s also an Amazon’s Choice product that has been bought 1,000-plus times in the last month. You can probably ...

I’ve had Viviscal’s Hair Thickening Serum open in a tab for a few weeks, but I’m finally ordering it now that it’s just $10 (that’s a 50-percent discount). My introduction to Viviscal was in the 2010s ...