does it need refrigeration after opening

No. I have kept mine in my bathroom medicine chest and it has maintained freshness. Excellent supplement.

whats the difference between this bottle with the white cap and the other with the black cap? both say 500 mg and 90 capsules

There is no difference between the two

how big are the capsules?

they are not to big. should be easy to swallow.

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Premium Black Seed Oil Capsules - Cold Pressed Nigella Sativa Aids in Digestive Health, Immune Support, Brain Function, Gluten Free, Non GMO - 90 Count, 500mg

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