There are lots of possible reasons for sheds, whether it's seasonal, body catching up from stress a long while back, among other things. Also 10 hairs a week is far under average shedding, since average can be 50-100 a day or more.
Supplements can do different things for different people, too. MSM has been known to give some people headaches for example. If you're worried it's the MSM try going off it for a little while and see if that changes anything.
ETA: Also when you pull out hair that you think is shed I would check for bulbs to see if it is actual shedding and not breakage.
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