From what I can see they are just herbal tablets? The info I looked up (the product leaflet) said that there could be interaction with other sedatives and to avoid excessive alcohol
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The only herbal preparation mentioned in relation to HRT is St John's Wort and none in relation to levothyroxine (from what I could see).
How to find out is google whatever your medication is and then "spc" and you will get the detailed product information. Summaries of Product Characteristics - as they are known, follow a standard format, and known interactions are found in section 4.5 - of whatever product it is you are looking up.
As the others have said - there are different ways of finding out too
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Hurdity x