Vitamin B complex [B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), B5 (Pantothenic Acid), B6 (Pyridoxine), B7 (Biotin), B9 (Folate) and B12 (Cobalamine).]: symptoms of deficiency, reasons, benefits (energy, skin) and tips on taking vit b supplement #F4F #L4L