Josh, I'll have to check out the book! Jody, just link back to your site. Hopefully you have analytics set up for your website, which it make it easier for you to track how many people clicked on that link from Facebook--helping you understand how important your Facebook business page is for your company.
The average (or more correctly the arithmetic mean) amount of vitamin k contained in 100g of grapefruit juice, based on the list below of 6 different items under the general description of grapefruit juice, is 0.02 ug of vitamin k.
This is for a 7 oz fruit. A medium whole grapefruit, again without sugar added has 41 calories in its 9 oz total weight. A large whole grapefruit which is almost 12 oz on average contains 53 calories altogether. 1 cup of grapefruit juice (with the sections) has a total calorie count of 74 in its 8 oz serving portion. The fruit has 9 calories per ounce and 0 per gram (too small to measure).