PDK Labs' pills usually use a low number sequence. Most have two digits; a few pills go up into the 300 series. This is the first time I've seen such a large number sequence accompanied by the PDK logo (K with an arrow).
Generic Name: Herbal Ingredients Manufacturer: Various Type: Dietary Supplement Class: OTC Comment: Image courtesy of 4andsic. Caffeine is the major active ingredient.
Generic Name: Caffeine Strength: 200 mg Manufacturer: Bell Pharmaceuticals Trade Name: Jet Alert Type: Stimulant Class: OTC Size (mm): 15 X 6 X 5 Comment: Be aware that there are probably many yellow oblong pills imprinted with '200' from all over the world. This is a US over-the-counter medication with a vague imprint.