Riboflavin is fine, or you can use the vitamin electrolyte for a few days. Electrolytes should not be used for more than 5 days, since they can lead to diarrhea. When recommending riboflavin, I like B complex which has all of the B’s and is hard to overdose since any excess is excreted. 1/4 tablet is fine, or 1/4-1/2 of the riboflavin.