Bringing non prescribed Testosterone into Japan

My testosterone is illegally obtained so no prescription, If you have anything to say about that, please keep it to yourself.

I need to take 2x injections whilst in Japan for 2 weeks.

My Testosterone will consist of 2x already loaded syringes and needles in my toiletries in my checked luggage.

Has anyone done something similar? Can anyone give any advice or experience?

Thanks