while you’re correct about the FA part. this card specifically says in “fat (adipose tissue)”. I’m trying to find something that confirms that B3 is specifically in fat/adipose tissue and I found this I’m AMBOSS (https://next.amboss.com/us/article/k60mOS?q=adipose+tissue#Z6b22e2574b5e0a104fa7921b73479ba3)
I could be overthinking this however