For many months I've been taking a large dose of biotin to repair my nails after having had gel polish on them too frequently. For some reason I googled "biotin overdose", just because I became concerned about possibly taking too much biotin. My nails have never been so healthy and grown so fast...almost oddly so.
Whaddya know. Biotin is processed through the kidneys. The only issue that can occur with too much biotin is frequent urination. Hmmm! So besides halving the dose of Amantadine I've cut down my biotin dose. It would be amusing if the biotin is the culprit, after all - or the combination of the 2 substances.