Considering purchasing the Biotin strength:10, 000mcg 100capsules by Natrol through Amazon. Advice please? Do uknow better company for vitamin pills

No harm! Biotin is used for bail and hair health! 10K mcg has no toxicity and has been shown to work.
Who knows ? By definition, "alternative" is different than modern western medicine. Generally any drug, herb, treatment, or supplement that stands up to rigorous scientific scrutiny is included in modern medicine. The problem is that many alternative practices, herbs etc do not stand up to scientific scrutiny and cannot be shown to work. They therefore remain "alternative". Be careful. Watch your $ ?safe.
That's a big dose. A normal person (without biotin deficiency) eating a well-balanced diet can be just fine without buying additional biotin supplements. The NIH reports: no recommended dietary allowance (RDA) for biotin; but adequate intakes for biotin are 7mcg for infants, 8mcg for children aged 1-3 yrs, 12mcg for 4-8 yrs, 20mcg for 9-13 yrs, 25mcg for 14-18 yrs, 30mcg over 18 yrs, 35mcg for breastfeeding women.