By Charlotte Smith & Julia Banim Those with acne know all too well how frustrating it can be to try product after product to no avail. Adult acne can be caused by a number of issues, from hormonal changes to certain medications, and it isn’t always quite as simple as just applying a soothing cream. But sometimes skin can clear up from the inside out, as those who swear by a nifty 6p tablet have found. Best of all, these wonder tablets can also have beautifying effects when it comes to your hair and nails, making for a true head-to-toe glow-up for a very reasonable price. The miracle product in…