If you are only using for extraction and taking orally and never doing an IM injection with that bottle once a pin is reused there is no problem. (e.g. squirting the contents of the syringe into your mouth, then drawing it up again).
The food you place in your mouth on a day to day basis is far less sterile, but we all live. Gastric contents (pH), the tight junctions in intestinal epithelia and immune surveilance that is prominent in the digestive system (and I suppose your natural gut flora) all contribute to your natural innate immunity.
Save the extra needles. Gear costs enough as is.
NFG