Idk about vitamins, it seems to be a bit contrived.
My ADHD stimulants come in hard pills and capsules. Capsules are long absorbtion, they release the drug more slowly in the digestive system. The hard pills are a short burst, usually with lower doses.
It makes a ton of difference to me, but I just eat vitamins as hard pills. Some are difficult to swallow, but I can deal. Some can’t, and capsules are likely better.