Ok suppose I take a powerbar thats loaded with 20g of protein and has 100% of Vitamin C as it states in its nutrition facts...only reason i take em is cuz theyre a good source of protein, but will this concentration of vitamin c affect the adderall absorption even when i took my pill 5 hours before?

I'm interested if anyone has perspective on this too... I take 20mg IR twice a day, but I have to eat a powerbar protein plus w/ 100% vitamin c everyday because I workout every morning and I need a quick, easy source of protein after I lift. Problem is, after I workout in the morn, if I eat the bar and then take my first dose of the day, I feel like the pill is not working. Recently, I've tried eating the bar at noon, right before my second dose of the day, and it sort of worked, but I don't want to punish my body at the gym, and then not replenish my system with any protein or carbs for that matter. Does one have to drink a lot of citric fruit juice like OJ to interfere with adderall's absorption? or can the chemicals in a 100% vitamin C proteinbar mess with it as well?

I think this is a very good question. From what I understand, it's the acids in citrus that cause the interference with Adderall absorption. Acids (especially citric acid) cause your body to absorb the Adderall more quickly and excrete it into the kidneys. So, if you wash down your Adderall with orange juice, it kind of washes it away. (somebody PLEASE correct me if I am wrong!)

It's funny, a lot of power bars have tons of vitamin C. But I know that there are docotors on the internet who recommend them for ADHD patients on meds becuase they are a quick source of protein, and often can be tolerated by tummies made finicky due to the meds. If you have loss of appetite due to Adderall, you know what I mean about how hard it can be to make yourself eat something, and power bars are often something that people can and will eat.

I find Adderall has less "oomph" if I take it on a full stomach, so the C in the power bar might not be why it feels less effective, it could be due to taking it with food in general.

I think the adderall is only affected if taken within the hour of taking the medication... trying to remember what my doc said..., because I drink Grapefruit juice religiously. I drink it an hour later and I feel ok...adderall is working.

There are really 2 sides to this absorbtion and excretion.

Absorbtion is effected around 30% by stomach PH. Things that make your stomach more acid ie. Orange juice, carbonated soda's, or anything that gives you heartburn injested at (or near) the dose should reduce absorbtion.

the primary factor in excretion is urinary PH. Low PH (more acidic) = faster removal. normal urine PH 6-8 removes ~60% to ~30% over 24 hours. Low PH ~5 removes ~75% over 24 hours. and High PH >8 can drop removal down to 1% over 24 hours. Each point increase in PH increases the halflife by ~7 hours.

Its fairly difficult to get urine PH levels outside of normal without medication/trauma/disease. However diet can shift PH dramaticly 1-2 points.

A non intuitive thing is alot of acidic things that make urine PH less acidic like lemon/vinegar etc..

BobC