People may choose to take supplements while fasting, but it ultimately depends on the individual’s personal beliefs and goals for fasting. Some people may choose to avoid supplements during a fast in order to fully experience the benefits of the fast and allow their body to reset without any external inputs. Others may choose to take supplements to support their health and wellness during a fast.

As for religious fasting practices, it depends on the specific religion and the interpretation of the rules. In some religions, supplements may be allowed during fasting as long as they do not contain any food or nutrients that break the fast. For example, Muslims who observe the fast during Ramadan are allowed to take vitamins, but they must be taken outside of the fasting period. Similarly, some Christians may allow for the consumption of supplements during fasting as long as they do not contain any food or nutrients that break the fast.

Recommended Supplements to Support Your Body During Fasting

Here are some typical supplements you can take while fasting:

  1. Electrolytes: Electrolytes such as sodium, potassium, and magnesium are important to maintain the balance of fluids in your body. You can take them in supplement form or add them to your water.
  2. Multivitamins: A daily multivitamin can help ensure you are getting all the necessary vitamins and minerals your body needs during a fast.
  3. Vitamin C: Vitamin C is water-soluble, which means it can be taken during a fast without breaking it. It’s a powerful antioxidant that helps boost your immune system and supports collagen production.
  4. B vitamins: B vitamins are essential for energy metabolism and help your body convert food into energy. They are also water-soluble and can be taken during a fast.
  5. Omega-3s: Omega-3 fatty acids are important for brain health, heart health, and inflammation. You can take fish oil supplements or consume omega-3 rich foods such as chia seeds, flaxseeds, and walnuts.

While fasting, it’s generally recommended to limit your supplement intake to water-soluble vitamins and minerals, as they can be easily absorbed by your body without disrupting your fast.

Potential Consequences of Nutrient Deficiencies During Fasting

If you do not take supplements while fasting, you may be at risk of nutrient deficiencies, especially if you are fasting for an extended period of time. Fasting can limit your intake of certain nutrients, such as vitamins and minerals, which are essential for maintaining overall health and wellness.

Some of the potential consequences of nutrient deficiencies while fasting include:

  1. Fatigue and weakness: Low energy levels and fatigue can occur due to a lack of essential nutrients, such as B vitamins, that are needed for energy production.
  2. Muscle loss: Without sufficient protein intake, your body may break down muscle tissue to meet its energy needs.
  3. Weakened immune system: Nutrient deficiencies can impair immune function, leaving you more susceptible to illness and infection.
  4. Electrolyte imbalances: Fasting can lead to an imbalance in electrolytes, such as sodium, potassium, and magnesium, which can cause dehydration, muscle cramps, and other complications.
  5. Nutrient deficiencies can also impact other bodily functions and processes, including digestion, hormone regulation, and cognitive function.

To avoid these potential consequences, it’s important to ensure you are getting adequate nutrition during a fast. Taking supplements, particularly those that are water-soluble and easily absorbed, can help provide your body with the essential nutrients it needs while fasting.


“Effects of Intermittent Fasting on Health, Aging, and Disease” by Mark P. Mattson, published in The New England Journal of Medicine, 2019:
“The Effects of Fasting on Markers of Metabolic Health: Implications for Longevity and Disease Prevention” by Valter D. Longo and Mark P. Mattson, published in Annual Review of Nutrition, 2014:
“Intermittent Fasting: The Science of Going Without” by Michelle McMacken, published in Harvard Health Blog, 2018:
“Nutrition in the Fast Lane: Fasting-Induced Autophagy Boosts Immune System” by Fernando Macian and Susana R. Neves, published in Nature Reviews Immunology, 2020:
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Last modified: May 24, 2023