I went on vacation to Bali recently. My platelets when I left were 104. One of the breakfast options in Bali was "Papaya Juice" which is really a Papaya smoothie which I had daily for 2 weeks. I tested my platelets when I got back and they were up to 141.
Other things I did different on vacation included eating more fish and adding a supplement that is basically broccoli seed sprout extract (anti cancer).
I can not say for sure it was the papaya since there are other variables, but I am trying to eat papaya more or less daily and also adding papaya leaf tea. Broccoli sprouts are now at my local whole foods, so I am eating those (1 ounce) a couple times a week.
Next blood test in 3 months.