can you tincture fresh produce or is that dangerous

I want to take blueberries as they are said to help with triple negative breast cancer which I have and also kill cancer stem cells. Also broccoli and broccoli sprouts do this but hard to remember to take daily so I want to tincture the fresh produce.

Is this ok will the vodka preserve this. I have tinctures some produce items over the years but never questioned it as did not do them long term.

I have been taking a broccoli (fresh) tincture for weeks and today heard blueberries also kill cancer stem cells but especially good for triple negative and would like to take them but they don't last long and my freezer is full..will adding them to vodka and making a tincture hurt.

I think Dr Schulze said one can tincture fruit or veggies but cant remember for sure..he said that tinctures last at least 5 years to 100 years and still be safe--- would blueberries or broccoli etc last a lot less time. I don't want to get sick or not know they are spoiled or something.

Must one dehydrate grind and then tincture or can they just add the blueberries fresh and make a tincture so I can make this a few times a day

Please help if you know anything about this