Herbal laxative tea

Dear MH.. I was wondering if you could tell me about the health benefits of an herbal laxative tea called Smooth Move by Trad. Med. The ingredients are:
Sennosides &B (from senna)
Senna leaf
Licorice root
Bitter fennel fruit
Org. orange peel, cinn. bark, corriander seed, ginger
Orange peel oil

I take this tea at bedtime and am wondering if Senna accumulates toxins or if I may use this daily for as long as I wish?

Blessings
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