Out of all the collagen in the market is the best I've ever tried. the first thing i noticed taking this is that my sleep became AMAZING. i take this (20-30mL in half a cup of tap water) just before bed and make sure I'm not full on food. it tastes great too. also makes my skin glow and my hair darker which in turn makes me looks younger. I'm not sure about improving muscle definition as it really hasn't done anything yet in terms of body composition, however i love it because of sleep and makes me look younger. hope this has helped, also i noticed results after about 2weeks.
Also, (pnb-673(no space) gets you a LIFETIME Dis€ount and SAVE on every single order when you €heckout on any product on here