I started lifting a month ago. I started taking zma daily a week before I started lifting.

Last night I missed taking it for the first time. My workout was harder today. I've been consistently increasing the weight but this time I decided to keep to last sessions weight, and struggled more than I would if I increased it. Everything ached quicker, I was sweating more and it started quicker, it was harder to lift weight I've done before without as much issue.

I'd say I even slept better lately so it's not that, any my recovery has been the same otherwise. Diet is the same.

Thats the only factor, so I'm wondering if it really makes that much difference or if its placebo / missattribution.

Edit: I worked out at 4pm instead of 5 or 6 like normal. But I doubt that had such a profound impact.