Hask Beauty Charcoal with Citrus Oil Purifying Shampoo

I first got to know this product when I received a sample. Tried the sample when I was hospitalised and didn't shampooed my hair for 4 days. I used 3/4s of the 10ml pack and this was so effective at removing the grime, gunk and oiliness immediately. My hair felt refreshed and light and the scent was citrusy and uplifting, especially after 4 days of hospitalisation.

I was so convinced I bought a full-size product to try, but I have been disappointed after trying this for 3 months so far. The formulation seems to have changed - it doesnt foam as much, and my hair gets oily again in less than 2 days, nothing compared to the effectiveness it had when I was in the hospital. I also lost more hair during washing than when I first tried it in the hospital. This formulation seemed more "diluted" than my sample, sigh.