I’ve been taking this for over a year and it does work, however I have noticed the quality of it has declined in recent months. It has become pale watery and doesn’t have that deep unmistakable orange yellow of earlier batches. And it doesn’t last a full month I ran out 3 days ago (Thurs) but the payment for my next supply was only debited yesterday (Sat) meaning the earliest I will receive the order is Tuesday so 5 days without. I am very careful to measure 1ml so I don’t use it up quicker. The problem with the sale part of their approach by subscription is that you cannot buy a spare for these occasions because you have to sign up the more subscriptions. This needs addressing to allow one off purchases.