Oh, Receiver. Someone is willing to go the extra mile for you. I can take it indicates that no matter what you desire or require, whatever the cost, this Bearer will accept. Whether offering reassurance in anticipation of a clearly troubling revelation or declaring one’s willingness to perform whatever task the Receiver may require, I can take it is an unequivocal statement of dedication to the Receiver.
Context is paramount. Whilst a relieved or thankful Receiver may prefer the simple gratitude of Thank you or the genuine appreciation of You rock!, a Receiver with mischevious intent may find Evil laugh, Danger or a cynical Don't make promises you can't keep appropriate, or offer appropriate compensation for the imposition in question with I'll make it up to you.