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Do Vitamins Break A Fast? 

Understanding whether vitamins break a fast is crucial for those practicing intermittent fasting. Vitamins play an essential role in maintaining overall health, but their consumption during a fast can be a gray area. 

This guide explores the impact of vitamins on fasting and provides insights into which vitamins and supplements can be taken without disrupting your fast.

The Role of Vitamins in Our Health

Importance of Vitamins

Vitamins are vital for numerous bodily functions, including immune support, energy production, and cellular repair. 

They help bridge the nutritional gaps in our diet, ensuring that we receive essential nutrients that may be missing from our meals.

Types of Vitamins: Water-Soluble and Fat-Soluble

Vitamins are categorized into two types: water-soluble and fat-soluble. Water-soluble vitamins, such as Vitamin C and the B-complex vitamins, dissolve in water and are readily absorbed by the body. 

Fat-soluble vitamins, including Vitamins A, D, E, and K, dissolve in fats and are best absorbed when taken with a meal containing fat.

Do Vitamins Break a Fast?

Scientific definition and fasting principles 

Fasting involves abstaining from all or most caloric intake for a certain period, allowing the body to enter a state of ketosis and autophagy. 

According to Dr. Mindy, fasting promotes deep autophagy, apoptosis, and other healing mechanisms, aiding in cellular repair and metabolic health.

“With your hormones in harmony, fasting helps accelerate your metabolic rate—which also allows you to maintain a healthy weight.”

Said Cynthia Thurlow, NP, and Intermittent Fasting Expert

General impact of vitamins on fasting 

Certain vitamins and supplements can impact fasting benefits by altering metabolic responses. 

For example, antioxidants like Vitamin C and E can nullify fasting benefits, such as increased SIRT3 gene expression, which enhances the body’s ability to process oxidative stress and improve overall efficiency.

Common questions: Do gummy vitamins break a fast? Does medication break a fast? 

Gummy vitamins usually break a fast as they often contain sweeteners and gelatin, which add calories and protein. Medications, however, should not be stopped without consulting a doctor. 

For instance, thyroid medication might be taken during the fasting window for better absorption, as highlighted by Dr. Mindy.

Vitamins and Supplements That Won’t Break a Fast

Water-soluble vitamins

Water-soluble vitamins, such as Vitamins B and C, can be taken during a fasting period without breaking the fast. 

These vitamins dissolve in water and do not contain calories, making them suitable for consumption while fasting.


Electrolytes like potassium, sodium, and calcium are essential for maintaining hydration and electrolyte balance during fasting. 

Ensure electrolyte supplements are free from sweeteners or added calories to avoid breaking the fast.

Some multivitamins

Certain multivitamins that do not contain added sugars, fillers, or calories can be taken without breaking a fast. 

It’s crucial to read labels carefully to ensure they are suitable for fasting periods.

Collagen peptides

Collagen peptides are low-calorie supplements that support skin, hair, and joint health. 

When taken in minimal amounts, they are unlikely to disrupt fasting benefits, making them a viable option during fasting periods.


Probiotics promote gut health and can be taken on an empty stomach during a fast. 

Some probiotic supplements are designed to be more effective without food, helping maintain digestive health without breaking the fast.

Vitamins and Supplements That May Break a Fast

Fat-soluble vitamins 

Fat-soluble vitamins, such as Vitamins A, D, E, and K, are best absorbed with food that contains fat. 

Taking these vitamins during a fasting period may break the fast as they need to be consumed with a meal for optimal absorption.

Gummy vitamins and flavored supplements 

Gummy vitamins and flavored supplements typically contain sugars and gelatin, which add calories and protein. 

Consuming these during a fasting period can disrupt ketosis and break the fast, negating some of the fasting benefits.

Supplements with significant calories or additives 

Supplements that contain significant calories, sweeteners, or other additives can interfere with the metabolic state achieved during fasting. 

These supplements can trigger an insulin response and should be avoided during fasting periods.

How to Take Vitamins While Fasting 

Best practices for taking vitamins 

When taking vitamins during a fast, opt for those that can be consumed on an empty stomach, such as water-soluble vitamins. 

Avoid vitamins that require food for absorption to ensure you don’t break your fast.

Timing and types of vitamins

For optimal results, take water-soluble vitamins and essential electrolytes during your fasting window. 

Fat-soluble vitamins and any supplements that cause nausea should be taken during your eating window to ensure proper absorption and comfort.


In summary, while fasting, it’s crucial to be mindful of the vitamins and supplements you consume. Water-soluble vitamins, certain electrolytes, and probiotics are safe and won’t break your fast. 

However, fat-soluble vitamins, gummy vitamins, and supplements with significant calories or additives should be avoided. For best practices, take appropriate vitamins during your eating window and consult with your healthcare provider to tailor your supplement regimen to your fasting routine.

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