This is the one I have Nate:
Phenibut HCl (Crystals) - 200 Grams (7.05 Oz) - 99.5+% Pure - FBLM

And I think 1/8 tsp = 0.5 grams. Not 100% sure. Just afraid to hit 2 grams my first night (4 scoops) lol.

It came with a card that says:
Clear 0.625cc = 1/8th Teaspoon Scoop which measures approx:
250 - 400 mg (for powders similar to flour)
400 - 600 mg (crystals similar to sugar)