Thera-D® Vitamin D Supplements

Independently tested and certified. Thera-D is tested and certified by NSF® International for content accuracy and purity, so you know exactly what you’re getting.

Flexible dosing. Thera-D is available in three different doses to meet your individual vitamin D needs: 50 mcg (2,000 IU), 100 mcg (4,000 IU), and 150 mcg (6,000 IU).

Quality you can trust. Thera-D is manufactured in the USA in a cGMP compliant facility.

Thera-D contains vitamin D₃, the same type of vitamin D produced in your skin after sunlight exposure. Prescription vitamin D typically contains vitamin D₂, the plant form of vitamin D. When produced commercially, it is made from yeast.

Your body metabolizes vitamin D₃ more efficiently than vitamin D₂, and vitamin D₃ supplementation is less likely to result in toxicity.* Studies have shown that daily vitamin D₃ is two to three times more efficient than high-dose weekly or monthly vitamin D₂.* Vitamin D₃ is considered the superior supplemental form of vitamin D.*

Think of vitamin D like your body’s MVP. Vital for heart, immune, and bone health, vitamin D plays huge roles in keeping your body healthy.* Research also shows that maintaining a healthy vitamin D level is important for both male and female fertility.*

Research suggests that doses between 50 mcg (2,000 IU) and 100 mcg (4,000 IU) are both safe and effective at maintaining healthy vitamin D levels.* Individuals with higher weights, those that take medications that affect vitamin D metabolism, or those that have difficulty absorbing vitamin D may need even higher amounts of vitamin D each day.* Talk with your healthcare provider to find out how much vitamin D you need each day.

No. There are no expected side effects from Thera-D.

Yes. You can continue to take most other supplements along with Thera-D, including Companion, TherOmega, NeoQ10, Ovasitol, CalMag Thins, Theratonin, TheraCran One, Prostate SR, CurcuSorb, OptiFlex Complete, and Canabrex. Do not take Thera-D with other supplements that contain a high dose of vitamin D, unless otherwise directed by your healthcare provider.

The list below includes some of the more common potential interactions. This is not meant to be a comprehensive list or take the place of advice from your healthcare provider. As with any dietary supplement, discuss with your pharmacist and/or healthcare team to determine whether Thera-D can be taken along with your medications.

Calcipotriene (Dovonex): Taking vitamin D along with this medication may increase the risk of hypercalcemia. Consult with your healthcare provider if you’re taking this medication along with Thera-D.

Digoxin (Lanoxin): Higher doses of vitamin D (above 100 mcg/4,000 IU) may increase the risk of hypercalcemia. Avoid taking Thera-D 4000 or Thera-D 6000 along with this medication, unless otherwise directed by your healthcare provider.

Diltiazem (Cardizem): Higher doses of vitamin D (above 100 mcg/4,000 IU) may decrease the therapeutic effects of this medication. Avoid taking Thera-D 4000 or Thera-D 6000 along with this medication, unless otherwise directed by your healthcare provider.

Verapamil (Calan): Higher doses of vitamin D (above 100 mcg/4,000 IU) may decrease the effectiveness of this medication. Avoid taking Thera-D 4000 or Thera-D 6000 along with this medication, unless otherwise directed by your healthcare provider.

Yes, all Theralogix products are FSA/HSA eligible. For one-time purchases, you can select Flex at checkout to pay with your FSA/HSA card. You may be asked to complete a brief questionnaire to verify eligibility. For subscription orders, you can submit your purchase for FSA/HSA reimbursement. Learn more about Flex and FSA & HSA eligibility here.