"it is however" is a correct and usable phrase in written English. It is used to introduce an idea that may be in contrast to the previous sentence. For example: "I will not be able to attend the meeting tomorrow. It is however, important that I submit my report on time.".
It is, however, worrying.
It is, however, delicious.
It is, however, narrowing.
It is, however, warping.
It is, however, unlikely.
It is, however, subjective.
It is, however, effective.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu