TheraLithXR Bottle

TheraLith® XR

Our extended-release magnesium, potassium citrate, and vitamin B6 supplement formulated to support and maintain normal urine chemistry.*

TheraLith XR includes automatic refills timed to arrive just before you run out. The auto-refill program includes free delivery.

90-day supply
auto-refill program
$60.00
($50.00 when using a
Provider Referral Code)

* This statement has not been evaluated by the Food and Drug Administration.
This product is not intended to diagnose, treat, cure or prevent any disease.

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More About this Product

Frequently Asked Questions

Q. Who is likely to benefit from TheraLith XR?

A. TheraLith XR is designed to support and maintain normal urine chemistry.* If you have had a 24-hour urine test and been told you have low urinary magnesium or citrate levels, or high oxalate or calcium oxalate supersaturation levels, you may benefit from TheraLith XR. Ask your urologist more about TheraLith XR and whether it would benefit you.


Q. How much TheraLith XR should I take per day?

A. The recommended dosage of TheraLith XR is 2 tablets, twice a day, with meals. For example, take 2 tablets with or after breakfast and 2 tablets with or after dinner.


Q. Are there side effects from TheraLith XR?

A. There are no expected side effects from TheraLith XR.In a clinical trial testing the tolerability and effectiveness of TheraLith XR, all participants tolerated TheraLith XR well, with no adverse effects.

TheraLith XR should be taken with meals for best absorption and tolerability.


Q. Will TheraLith XR interact with prescription medications?

A. Please refer to the medication interactions information page to check whether your medication may interact with the nutrients in this product.


Q. Should I continue to take my multivitamin and other dietary supplements when I take TheraLith XR?

A. You can continue taking a low-dose multivitamin and mineral supplement. Low-dose refers to a multivitamin and mineral supplement providing approximately 100% of the Recommended Daily Allowance (RDA) and/or Adequate Intake (AI) of each, or most, nutrient(s). You will find this information listed on the supplement's label. If you have questions about any additional nutritional supplements that you are currently taking, please contact our Nutrition Department via email or by calling toll-free (888)899-3899, ext. 4.


Q. How can I avoid the high oxalate foods my urologist warned me about?

A. Your urologist may recommend that you reduce or eliminate your intake of oxalate-rich foods. Foods highest in oxalate include: chocolate or cocoa, spinach, rhubarb, beets, wheat germ, black teas (not green or herbal), some tree nuts (almonds, cashews, and hazelnuts are highest in oxalate), and legumes (beans, peanuts, soybeans). These foods have been shown to increase urinary oxalate levels. Generally when these foods are avoided, the oxalate content of other foods in the diet will total about 40-50 mg per day, the amount recommended for most calcium oxalate stone formers. If your doctor has recommended that you follow a low oxalate diet, more detailed information on the oxalate content of foods is available here.


Q. Is there anyone who should not take TheraLith XR?

A. Individuals with decreased kidney function (renal insufficiency or failure) should not take TheraLith XR. Individuals who have been instructed to follow a low potassium diet should not take TheraLith XR.

Women who are pregnant or nursing should consult their physician regarding the use of TheraLith XR. The concern with pregnant and lactating females taking TheraLith XR is the amount of magnesium in the product. Magnesium supplements are generally not recommended for pregnant and lactating women at doses greater than 350 mg per day due to the increased risk of stomach upset and diarrhea. However, TheraLith XR has been manufactured to delay the release of its active ingredients for three-to-five hours so that it is well-tolerated, and it has been certified to have passed testing for that delayed-release and disintegration, in accordance with USP Method 2040. Therefore, TheraLith XR should be well-tolerated, and thus would be safe for women to take while pregnant or nursing.


Q. How long should I take TheraLith XR?

A. TheraLith XR is meant to be taken on a consistent basis for optimal results. Please speak to your urologist about how long you should take TheraLith XR.


Q. What does the "XR" in TheraLith XR stand for?

A. Many medications and supplements use the letters XR to indicate Extended Release. TheraLith XR has been manufactured to delay the release of its active ingredients for three-to-five hours so that it is well-tolerated, and it has been certified to have passed testing for that delayed-release and disintegration, in accordance with USP Method 2040.


Q. Is this product gluten-free?

A. Yes. This product is gluten-free. Theralogix products do not contain any ingredients with gluten. Further, each Theralogix product is tested by NSF International for content accuracy, purity, and freedom from contaminants. During this testing process, each Theralogix product is also tested to confirm that there is no gluten present.


Q. What does the date printed on my Theralogix product mean?

A. Some Theralogix products list a MFRD ON (manufactured on) date. This is the month and year that the supplement was manufactured. The MFRD ON date indicates the freshness of the product. Other Theralogix products list an EXP (expiration) date. Theralogix is moving toward listing EXP dates on all products. In general, Theralogix recommends using products within 2 years from the date of manufacture.

To ensure best potency, nutritional supplements should be properly stored in a cool dry place, away from heat and moisture. If you have any questions about the shelf life of your product, feel free to contact our Nutrition Department by email or call us toll-free at (888)899-3899 ext. 4.


* This statement has not been evaluated by the Food and Drug Administration.
This product is not intended to diagnose, treat, cure or prevent any disease.