Please capitalize where necessary: as mentioned earlier, the components used in the hair supplement are all natural.
A: As mentioned earlier, the components used in the hair supplement are all natural.

Please capitalize where necessary: a mathematical model had been constructed where the earth was represented by a partially conducting sphere surrounded by an infinite dielectric.
A: A mathematical model had been constructed where the Earth was represented by a partially conducting sphere surrounded by an infinite dielectric.

Please capitalize where necessary: a grade round white freshwater pearl and champagne goden color rhinestone ball stretch beaded bangle bracelet
A: A Grade Round White Freshwater Pearl and Champagne Goden Color Rhinestone Ball Stretch Beaded Bangle Bracelet

Please capitalize where necessary: the mac operating system is the most talked about os among the present generation.
A:
The Mac operating system is the most talked about OS among the present generation.