Recognition as Top doctor

Dr. Zaidi was recognized as the only Top Doctor in Ventura and Santa Barbara counties in the field of Endocrinology, Diabetes and Metabolism, by Castle Connolly's respected TOP Doctors directory.


Dr. Zaidi was recognized among the top doctors in the nation by US News and World Report.


Dr. Zaidi's YouTubeVideos

What is Insulin Resistance and How it harms your body?

What Causes Insulin Resistance?

Who Should be Tested for Insulin Resistance and What are the Tests for Insulin Resistance?

What is the Treatment of Insulin Resistance?

Vitamin D: A Hormone

Vitamin D toxicity

Misconceptions about Vitamin D

How to Prevent another Angioplasty?

Vitamin D Test: Right VS Wrong test

Vitamin D and Diabetes

Vitamin D and Chronic Fatigue, Fibromyalgia, Body pains

Power of Vitamin D, book


WS Radio Interviews Doctor Zaidi


Dr. Zaidi interviewd on the TWC3 News


Dr. Zaidi's Radio Interviews on vitamin D part 1 part 2



WS Radio Interviews Doctor Zaidi

Dr. Zaidi interviewed on the Homestretch


Marie Claire interviews Dr. Zaidi


" Ventura County Star" writes about Dr. Zaidi


Dr. Zaidi talks to "Women's Health" about Vitamin D.


Dr. Zaidi's Articles

Diabetes and Stress connection

Alternative Therapy for Flu and Common Cold

Hormone D Deficieny - A Serious Endocrine Disorder

Why is Vitamin D so important?

Scientific evidence for the link between Vitamin D deficiency and Heart Disease

Scientific evidence for the link between D deficiency and Cancer

Statin Drugs Causing Diabetes-A new Side-effect

Sarfraz Zaidi, Basic Author

Dr. Zaidi's Blog

Vitamin D deficiency and Diabetes.

Vitamin D deficiency is extremely common during pregnancy.

Vitamin D is not a vitamin but a hormone.

Is Vitamin D the answer to America's health crisis?

Avandia and heart Disease controversy.

President Clinton's heart disease.


Diabetic vitamins formulated by Dr. Zaidi



VITAMIN D3 for Sublingual Absorption

Dr. Zaidi's Paintings

Dr. Zaidi's Photos


Vitamin D 

This is an Excerpt from Dr. Zaidi's book, "Power Of Vitamin D." Copyright © All rights reserved.


What is Vitamin D? 

Vitamin D is not a vitamin but a hormone. A hormone is a substance that our body produces. After its synthesis, a hormone is released into the blood circulation. Then it reaches many distant organs and exerts its medical effects.

Vitamin D-A Hormone 

Vitamin D is produced in the skin from 7-dehydrocholesterol (pro-vitamin D3) which is derived from cholesterol. Here is evidence that cholesterol is not all bad, contrary to what most people think these days. The fact is that cholesterol is a precursor for most hormones in your body.  

Type B Ultraviolet rays (UVB) from the sun act on pro-vitamin D3 and convert it into pre-vitamin D3, which is then converted into vitamin D3. Medically speaking, we call it cholecalciferol. Vitamin D3 then leaves the skin and gets into the blood stream where it is carried on a special protein called a vitamin D-binding protein.  

Through blood circulation, vitamin D3 reaches various organs in the body. In the liver, vitamin D3 undergoes a slight change in its chemical structure. At that point, it is called 25, hydroxy cholecalciferol or 25 (OH) Vitamin D3 (or calcidiol).  It is then carried through the blood stream to the kidneys where it goes through another change in its chemical structure. At that point, it is called 1,25 dihydroxy cholecalciferol or 1,25 (OH)2 vitamin D3 (or calcitriol) . This is the active form of vitamin D. It gets in the blood stream and goes to various parts of the body and exerts its actions. That is why vitamin D is really a hormone.  

With the discovery that vitamin D is a hormone, scientists found the main effect of vitamin D was on calcium and phosphorus absorption from the intestines.  

It was also realized that people with kidney failure cannot convert 25 (OH) vitamin D into 1,25 (OH)2 vitamin D. Therefore, people with chronic kidney failure on dialysis were placed on a synthetic supplements of 1,25 (OH)2 vitamin D which is also called calcitriol. Drug companies saw an opportunity and started manufacturing calcitriol (brand name Rocaltrol). Soon, it became a standard of medical practice to prescribe calcitriol to every patient on chronic kidney dialysis.  For most physicians, this is where their knowledge of vitamin D ends.

 In the last couple of decades, researchers discovered that vitamin D is not only involved in the absorption of calcium and phosphorus from the intestines,  but also plays an important role in the normal functioning of every system in the body.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to prevent, mitigate, treat or cure any disease.

Health benefits of Vitamin D

Myths about Vitamin D

An Epidemic of Vitamin D deficiency

Test to Diagnose Vitamin D deficiency

Treatment of Vitamin D deficiency

Vitamin D toxicity

Vitamin D and Diabetes

Vitamin D during Pregnancy

Vitamin D and Shingles

Vitamin D and Nasal Allergies


Warnings – Disclaimer: This website is for educational purposes only. The information as well dietary supplements in this website are not intended to diagnose, treat, cure or prevent any disease. *These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are Not intended for use by pregnant or nursing women. If you are taking any medications, planning any medical or surgical procedure or have any medical condition, consult your doctor before using any of the supplements. Discontinue use and consult your doctor if any adverse reactions occur. Keep out of reach of children. Do not use if outer wrap is missing or torn. Store at room temperature.

photoJafer Nutritional Products, in collaboration with Dr. Zaidi, now makes available a high quality Vitamin D3 formula for Sublingual absorption.

Each tablet contains 5000 IU of Vitamin D3.



Regular Price = $29.95 per bottle


Sale Price = $19.95 per bottle




You can now make your secure purchase online using the PayPal shopping cart. It is not necessary to be a PayPal member, you can just use your credit card.

 Note: We do not ship outside the USA. Sorry for the inconvenience.



This article was written by Sarfraz Zaidi, MD, FACE. Dr. Zaidi specializes in Diabetes, Endocrinology and Metabolism.

Dr. Zaidi is a former Assistant Clinical Professor of Medicine at UCLA. Currently he is Medical Director of the Jamila Diabetes and Endocrine Medical Center in Thousand Oaks, California.



Copyright © All rights reserved.