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Looking at the ingredient list for Tivka Plus, it looks like a very comprehensive multivitamin supplement along with some super-antioxidants and some amino acid supplements. Nothing is greater than what you should take, so it looks to be safe.
If you are taking any other supplements, however you might want to discontinue any that are contained in this product.
Here is a link to the ingredient list, just in case you don't have it: Tivka Plus
To treat high blood pressure naturally, the most effective strategies are:
In addition to all this, I would advise that you monitor your blood pressure frequently so that you know if your strategies are working for you. If not, and your blood pressure is consistently over 150/90 you really should consider seeing a regular doctor. High blood pressure can cause damage to almost every organ in your body if left unchecked.