Breaks in the intake of biotin!

Hi everyone! I'm a newbie

I have some questions about biotin... Some time ago I took 1.5 mg of biotin daily. They were 500 mcg capsules of a herbalist's brand called Lamberts and I took three each day. I took it mainly for my nails, but hoping that if would also improve my hair's condition. I was very happy with the results in my nails, but didn't notice anything spectacular in my hair.

Since I read that you have to take 2.5 mg of biotin to see results in your hair, and in the prescription of Lamberts' biotin it said that you could only take 3 pills a day (which is 1.5 mg) I decided to look for another brand of biotin so that I could up my dosage.

Then I found a pharmacy brand which sold tiny little tablets of 5 mg of biotin. I swapped Lamberts' biotin for the 5 mg pharmacy one called Medebiotin Fuerte, but the results were disastrous!! My nails came back to normal, but the worst thing of all is that I started shedding hair like crazy!! I suppose it was the result of stopping to take Lamberts' biotin. So it was really doing something in my hair, even though I hadn't noticed anything special at the time!!

My question is if somebody had similar problems when they stopped taking a certain brand of biotin. Another thing I wanted to ask is if it is really necessary to take breaks in the intake of biotin to let the organism have a rest, or if the results keep always being the same even if you take biotin all year round. Because I don't know if it's like other supplements that lose their effectiveness after you've been taking them for a long time. Can you take biotin nonstop?

I have one small request. Please, could you tell me which brands of biotin are you/have you been taking? It's important for me to know this detail, since my problem with the hair loss started when I switched to the pharmacy biotin