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Our ZRT Labs Vitamin D and Testosterone blood spot home test kit test your levels of Vitamin D2, Vitamin D3 & Total Testosterone all in one test. Studies have shown that men with low levels of Vitamin D often have low levels of Testosterone as well and visa versa so running both of these tests simultaneously is a good way to determine overall male health.Side effects of a Vitamin D deficiency may include: frequent bone fractures, chronic muscle or joint pain, depression and a poor immune system. Side effects of low testosterone in men male include: low libido, weight gain, muscle weakness or low of muscle and lowered physical energy. If you are experiencing any of these symptoms, then our test may be perfect for you! Our ZRT Laboratory blood spot hormone test kit is an easy-to-use at home test with fast confidential results. No additional fees for those located within the U.S. and test comes with a prepaid shipping label. Results are typically available approximately 3-5 business days upon receipt of sample at the lab and are emailed to you once available. Please note: Due to state law, this test can not be shipped to NY state.