A suggestion for brainchip if possible would be a great seller imo.
A vitamin deficiency test, or nutrients test, assesses vitamin or mineral levels in the blood. Either finger-prick blood tests or venous blood tests via a portable device .
I tried sticky-tapping an Akida chip on my head. It didn't detect any vitamin deficiencies, but it told me I was running dangerously low on brain cells.
The sticky-tape kept wrecking my hair, so I upgraded to a spaghetti colander as a mounting system.
Then once I stabilised the neural interface (aka tightened the chin strap), things escalated quickly and I started being able to communicate with aliens, a deceased dolphin and a pod of blue-whales.