It’s a follicle fiasco. Women are flooding social media with warnings about one of today’s trendiest drinks, sharing horror stories of sudden hair loss they say began after they started drinking it regularly. Could the viral “Gen Z green juice,” praised for its health benefits, really be sabotaging your strands? The Post asked two registered dietitians to get to the root of it. What is matcha? It’s a vibrant green tea made from specially grown leaves that are finely ground into a powder and