[A-2-C]

I also want to start taking Biotin but what confuses me is that the recommended daily dosage is 30mcg while swonssons and others have it in 5000 mcg!

RDA are always much much lower than what our body really needs. There are two reasons for this. One is that not enough research exists on "required" and "safe" dosages, so it's safer to recommend lower amounts (just in case). Two (and more important) - when government raises RDA for nutrients, they must meet those requirements for nutrition plans in armed forces, correctional facilities, health care organizations etc. This increase would result in so much higher costs that the government doesn't want to do it.

For all micronutrients I always use approach RDA x 20 at least

Biotin is water soluble, so it would be hard to overdo it.