It is the core that is where the enzyme is. The instructions I followed- fresh pineapple- cut into 5 slices. I would then cut each slice because the core is dense. Then I ate a piece a day. Just got my bfp today! The same enzyme is also in Brazil nuts. I am on aspirin per re orders, I do not know about taking it otherwise.
Also, consider acupuncture. My RE's office recommended it and gave me an approved list of acupuncturists who did fertility work.
take pine apple for 6-7 days after embryo transfer.......walnuts also aid in implantation.....take regularly your prenatal vitamins,fish oil,and baby aspirin....wish you good luck