To my knowledge, Flaxseed oil is not intended to have any effect on activity level; it is a wonderful source of omega 3,6 and 9 which are essesntial for general health and well being.
There is no supplement which can reduce activity levels; the omegas are said to improve concentration. Usually a good dose of exercise in the later afternoon helps to expel energy and can mark the beginning of the 'winding down' process which makes getting to bed a little easier.
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