Episode #0890

[It's up to the first poster to come up with a set up, and then each following post will either complete it or fill in the blank(s). And, as always, whoever posts the set up is certainly allowed to post their own completion/fill in as a follow up.]

Set-up:
JH: "There must be some explanation for the strange change that's come over you Barnabas, but what could it be?!"
BC: "Well, I __________, but you couldn't tell that from looking at me, not unless ________!"

Could pass it off as male vampire menopause

I'm deficient in more than just hormones