Bloomberg sources claim Apple’s quest for no-prick blood glucose monitoring is now at a "proof-of-concept stage" and good enough that it could come to market once it's smaller. The technology, which uses lasers to gauge glucose concentration under the skin, was previously tabletop-sized but has reportedly advanced nearer to an iPhone-sized prototype.
It’s been in the works for a long time. In 2010, when Steve Jobs headed up Apple, the company bought blood glucose monitoring startup RareLight. But no-prick monitors are a challenge. In 2018, Alphabet's health subsidiary, Verily, scrapped plans for a smart contact lens that tried to track glucose using tears.
– Mat Smith