I don't get the shakes from clen, not everyone does but I do get crazy cramps seems to target my neck area mostly making for some very awkward conversations lol.
A better way of checking if it's working is checking your heart rate and body temp. Your resting heart rate and body temp should rise while on clen.
I'm usually at a resting heart rate of around 80bpm, on clen I am above 100bpm resting. Last time I checked was 113bpm on a 100mcgs of clen.
If you have a problem with a product from a sponsor contact the reps here at PM, that is usually a faster response.