When I used grade A, I could tell a definite difference in the nutrition that I wasn't getting. I would get dizzy, lightheaded, and I felt really weak. If you are going to use grade A, I would suggest that you buy a bottle of blackstrap mollasses. If you start feeling dizzy or lightheaded, take a tablespoon of blackstrap to boost your nutrients.
Also, you should try to use organic maple syrup. Regular maple syrup is produced using formaldehyde.
When I did my last fast, I totalled up how much syrup I would need if I were going to drink 12 lemonades a day for 30 days. Then I bought enough syrup for the entire cleanse all at once. Maple syrup stores very well if it is unopened, so what I have left I'm going to use on my next clease. Here's a link to the online store where I buy my syrup from http://valuenutrition.com/ It's the best price I've found so far - 64 ounces for $15.63.