From the first time you hold the real glass heavy duty bottle with metal cap, you'll see quality written all over this product. I've been using this brand for a few years at this dosage twice a day and my D3 levels are now where they should be. I've had no side effects at all and, the only problem has been that at one time Amazon was out of these and I had to search all over the place to find them locally. I would go out of my way for the Solgar brand and if these are in stock at the time you're reading this and you need this dosage - don't hesitate
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