Well, it could be a marketing gimmick to get you to use up a lot of their stuff. Or, it could be a recognition on their part that pills are only absorbed 15-30% anyway, so you're not getting much out of each pill. (That's from the Physician's Desk Reference, by the way. If your abdomen were x-rayed, you'd see those pills working their way through your colon.)
There is an excellent powdered supplement that you mix in liquid (water or whatever you choose) that is highly absorbable, upwards of 90-95%. It's got everything you need rather than just a few nutrients, and will strengthen your immune system. It's safe for pregnant women - in fact, it's from a company whose lead scientist was one of the first to develop infant formulas, so he brought the standards of pediatric liquid nutrition into the industry. I work with many people who've used it as a prenatal, and their physicians/midwives have said that the umbilical cord is so thick from all the nutrition reaching the baby.
It would certainly not be more expensive than what you are doing now - less, and more effective.
You can buy it online but you get to work with a consultant who will help you, and there's unbelievable support. I can help you and also connect you with a colleague in Oregon if that makes a difference to you.
Let me know. But if you want to do this on your own, you want powder (not pre-mixed liquid - many ingredients break down over time), multiple ingredients (because they all work in partnership so 70+ is the standard), manufactured in US under near pharmaceutical grade conditions (not just distributed by a US company), a company with multiple patents on formulas (not just ingredients, and proving safety, efficacy and uniqueness), something safe for preemies through senior citizens, something with no warning labels, and based on clinical data/research.