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1.1Impurity introduction
There is no precise definition for "impurity," because of the apparent negativity
attached to this word in the pharmaceutical sciences. Webster's dictionary defines
impurity as something that is impure or makes something else impure A better definition
of an impure substance may be as follows: a substance of interest mixed or impregnated
with an extraneous or usually inferior substance. A simple definition for an impurity,
is, any material that aft arts the purity of the material of interest, viz., active ingredient or
drug substance. The impurities are not necessarily always inferior. From the standpoint of
its usage, the drug substance is compromised in terms of purity even if it contains another
material with superior pharmacological or toxicological properties. At first pass this may
not be readily clear; however, on further thought, it would become apparent that if we are
to ensure that an accurate amount of the drug substance is being administered to the
patient, then we must assess its purity independently from the extraneous materials.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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