It is important to always use other sun protection measures, along with your broad spectrum sunscreen, when spending time in the sun. Sunscreen provides protection against both by providing a chemical barrier that absorbs or reflects UV radiation before it can damage the skin.

There isn't a single 'number 1' sunscreen that is universally agreed upon as the best. The best sunscreen depends on individual needs, skin type, and preferences. However, some top-rated and recommended sunscreens include:

Dr. Sheth's sunscreens can be both physical (mineral) and chemical. They offer various formulations, including mineral sunscreens with zinc oxide and titanium dioxide. However, they also offer hybrid sunscreens that combine mineral and organic filters, as well as chemical sunscreens.

Tetracycline hydrochloride powder, a broad-spectrum antibiotic, is a yellow crystalline powder used in various pharmaceutical applications and cell culture. It's commonly used in capsules, tablets, ointments, and suspensions to treat bacterial infections. It can also be found in ophthalmic formulations for eye infections. Additionally, it's used as a selective reagent in molecular biology to isolate bacteria with tetracycline resistance genes.

Oxytetracycline dihydrate is a tetracycline antibiotic used in both human and veterinary medicine to treat a wide range of bacterial infections. It's a broad-spectrum antibiotic that works by inhibiting bacterial protein synthesis, thus preventing bacterial growth and reproduction.