The test I get in the USA from my doctor comes in a dark bottle. I've only seen 1 legit UGL company that made all there liquids in a darker bottle. There is an approved source that carries great gear, but it comes in clear bottles. I wouldn't worry about what color your bottle is, and worry about the quality. You can always store your juice in your closet, or in a box under your bed. Even if your juice was left in the sun, it would take awhile for it to start losing its bite.
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