How long is this effective once opened?

Once opened the tincture will start to oxidize, turn brown, and loose potency. We recommend using it within 6 weeks. Once it turns brown you can double your dosage. Thank you for your question! -Dr. Clark Store

"$29.30 ($7.33 / ounce)" it's a 2 ounce bottle. sells on the dr.clark store website for $15.65, which is $7.83/oz. is there an explanation?

Hello Arnold, this is a glitch in the system. This is a 4 fl oz bottle for $29.30 - The picture on this page is correct but the title is incorrect. Please be advised that when you are ordering the tincture for $29.30, you are to receive the 4 fl oz. You can order directly from our website to ensure you are getting the correct product. We are currently working on getting this title fixed to reflect the correct product. Thank you for letting us know about this error. Hope you have a great day Arnold! -Dr. Clark Store Team

Hello Sahara, thank you for your question. Yes, this tincture is GREEN when you open the bottle. The green tincture from the black walnut tree is an Extra Strength formula and far surpasses the potency of many other black walnut tinctures available. Refrigerate after opening and use within 6 weeks. Let us know if you have any other questions. -The. Dr. Clark Store Team

Is this the original product from Dr. Hulda Clark?

You should compare this product and the one at Dr. Clark website: http://www.drclarkstore.com/green-black-walnut-hull-tincture-extra-strength-1-oz/ - do your research and find out.

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