Can You Take Vitamins While Fasting? Water vs Fat-Soluble Guide (2026)
✨ Key Takeaways
- Learn the best practices of intermittent fasting for optimal health.
- Understand how to track your fasting windows effectively.
- Discover the science-backed benefits of fasting tips.
In This Article
Yes, you can take certain vitamins during your fasting window, but it depends on whether the vitamin is water-soluble or fat-soluble. Water-soluble vitamins (Vitamin C and B-complex) can be taken with plain water during a fast without breaking it. However, fat-soluble vitamins (Vitamins A, D3, E, and K2) and Omega-3 fish oils require dietary fats for absorption and should always be taken with your first meal inside your eating window.
⚡ Supplement Timing Cheat Sheet
- Take During Fasting Window: Electrolytes (Sodium, Potassium, Magnesium), Vitamin C, Vitamin B-Complex, Creatine (unflavored), L-Theanine.
- Take During Eating Window: Vitamin D3, Vitamin K2, Vitamin A, Vitamin E, Fish Oil / Krill Oil, CoQ10, Multivitamins with food bases.
- Avoid Entirely (Breaks Fast): Gummy vitamins (contain 3–5g sugar each), BCAAs, protein powders.
Complete Supplement & Vitamin Guide for Fasting
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- Barnosky AR et al. (2014). Intermittent fasting vs daily calorie restriction. Transl Res.
- Popkin BM et al. (2010). Water, hydration, and health. Nutrition Reviews.
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