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Due to the fact Dr. Riley silently performed this action, Kieran wasn't too sure as to what she meant. After all, it could be perceived in a couple of different ways. For example, Dr. Riley's action could imply that she wanted Kieran to consume 10 X-hancers. Or, it could mean that she wanted to make a brazen step and increase the concentration of X-hancers Kieran ingested.
Of course, a decision like the latter scenario mentioned also presented some extreme risks. The comparatively dense concentration of the X-hancers could cause irreparable damage to Kieran's body if his system couldn't handle the sudden introduction of energy more potent than what he consumed previously.
As mentioned before, one's journey to increasing the concentration of X-hancers consumed should be done steadily. Drastic increases caused a break in the chain of energy consumption and posed an incredible risk.