Intermittent Fasting Supplements: What Actually Helps (2026)
Intermittent fasting supplements can make a real difference to your results – but only if you choose the right ones. Most supplements marketed specifically for fasting are overpriced and unnecessary. This guide covers intermittent fasting supplements that are genuinely backed by research, which ones to avoid, and exactly when to take them during your fasting window.
Note: This post contains affiliate links. If you buy through our links we may earn a commission at no extra cost to you.
Does taking supplements break a fast?
This is the most common question from people starting intermittent fasting. The short answer is – it depends on the supplement. Anything containing calories technically breaks a fast by triggering an insulin response. Pure vitamins, minerals, and electrolytes in capsule or powder form generally don’t break a fast in any meaningful way. Protein powder, BCAAs with calories, and pre-workout with sugar definitely break a fast. Black coffee and plain tea do not break a fast and can actually support fasting by suppressing appetite.
Best supplements to take during a fast
These intermittent fasting supplements are safe to take during your fasting window without breaking the fast or significantly impacting your results. Electrolytes are the most important – fasting causes increased urination which depletes sodium, potassium, and magnesium. A sugar-free electrolyte powder keeps energy levels stable and prevents the headaches and fatigue many beginners experience during fasting. Creatine monohydrate is safe during a fast – it contains no calories and doesn’t trigger an insulin response. Black coffee enhances the fat-burning effects of fasting and suppresses appetite naturally. Magnesium glycinate taken during a fast improves sleep quality and reduces the muscle cramps some people experience when fasting.
Best supplements to take when breaking your fast
These supplements work best taken with your first meal of the day. Omega-3 fish oil is best absorbed with dietary fat – always take it with food. Multivitamins are better tolerated with food and fat-soluble vitamins like A, D, E, and K require dietary fat for absorption. Protein powder taken with your first meal helps hit your daily protein target and kickstarts muscle protein synthesis after the fasting period. Zinc and vitamin D are both better absorbed with food and are two of the most common deficiencies in people who train regularly.
Supplements to avoid while fasting
Avoid anything with calories during your fasting window – protein powders, mass gainers, BCAAs with added sugars, and pre-workouts containing carbohydrates all break a fast. Also avoid fat burners with stimulants taken on an empty stomach — they can cause nausea, anxiety, and heart palpitations without food to buffer them.
Best intermittent fasting supplements (2026)
We evaluated the most effective supplements for people following intermittent fasting protocols based on research, safety during fasting, and value. Here are our top picks:
Athletic Greens AG1 – The most comprehensive all-in-one supplement for people who fast. AG1 contains 75 vitamins, minerals, and whole food sourced nutrients in a single daily serving – covering everything from vitamin D and zinc to digestive enzymes and adaptogens. Technically contains calories so take it when breaking your fast rather than during your fasting window. Expensive but replaces 5-6 separate supplements making the cost more reasonable when compared product by product.
- AG1 RESEARCH-BACKED DAILY HEALTH SUPPLEMENT: AG1 is a research-backed daily health supplement that combines a multivitam…
- FOR MEN, WOMEN, PEOPLE AGED 18+: AG1 is suitable for a variety of different diets and lifestyles, including, paleo, keto…
- WHOLE-BODY HEALTH: AG1 fills nutrient gaps and delivers hard-to-get support for Gut Health, Digestive Regularity & Less …
Thorne Multivitamin – The best multivitamin to take when breaking your fast. Thorne Basic Nutrients is NSF Certified for Sport and uses highly bioavailable forms of each vitamin and mineral – the forms your body actually absorbs rather than cheaper alternatives that pass through unabsorbed. Contains methylfolate instead of folic acid and methylcobalamin instead of cheap cyanocobalamin. Take with your first meal of the day for maximum absorption of fat-soluble vitamins.
- Essential Nutrients: A daily supplement formulated with key vitamins and minerals to maintain health and wellness with j…
- Whole-Body Benefits: Contributes to a healthy diet by providing foundational support for heart, brain, nerve, immune, bo…
- Optimal Absorption: Provides bioavailable vitamins A, B1, B2, B3, B5, B6, B12, C, D, E, K1, and K2, as well as minerals …
BulkSupplements Magnesium Glycinate – The most important standalone mineral supplement for intermittent fasting. Magnesium is heavily depleted during fasting due to increased urination and most people are already deficient before they start fasting. Magnesium glycinate is the most bioavailable and gentle form – unlike magnesium oxide which causes digestive issues at higher doses. Improves sleep quality, reduces muscle cramps, and supports hundreds of enzymatic processes in the body. BulkSupplements delivers pure magnesium glycinate at the lowest cost per serving available.
- Foundational Elements for Wellness: Magnesium Glycinate powder, one of our magnesium supplements, are the cornerstones o…
- Designed for Optimal Health: Elevate your daily wellness routine with our Magnesium Glycinate powder, or Magnesium Bisgl…
- Convenient Powder Form for Easy Integration: Say goodbye to cumbersome pill regimes! Our Magnesium Glycinate supplement,…
Nordic Naturals Omega-3 – The best omega-3 supplement to take when breaking your fast. Nordic Naturals uses triglyceride form omega-3 which is significantly better absorbed than the ethyl ester form used by cheaper brands. Third-party tested for purity and freshness – important since low quality fish oils can be oxidized before you even open the bottle. Always take with your first meal containing fat for maximum absorption. Two capsules delivers 690mg of EPA and DHA combined.
- Why omega-3s – Research shows that the essential fatty acids EPA & DHA in fish oil support heart, brain, eye function*
- Doctor-recommended formula – Nordic Naturals Ultimate Omega features high concentration omega-3 fish oil in soft gels; T…
- Better absorption, better taste, no fishy burps – All of our omega-3 fish oil concentrates are in the triglyceride molec…
Optimum Nutrition Creatine – The best creatine to use during intermittent fasting. Creatine monohydrate is completely calorie-free and does not break your fast making it one of the few supplements you can take at any point during your fasting window. ON Micronized Creatine is Informed Sport certified, mixes easily, and is completely tasteless – add it to water, black coffee, or your pre-workout without affecting the taste. Taking 5g daily during your fast maintains muscle creatine stores and supports training performance regardless of when you eat.
- 5 grams pure creatine monohydrate per serving
- Supports increases in energy, endurance and recovery
- Maximum potency supports muscle size, strength, and power
Electrolytes – the most underrated fasting supplement
One of the most underrated intermittent fasting supplements is a simple electrolyte powder. Most people starting intermittent fasting experience headaches, fatigue, and brain fog in the first week. The cause is almost always electrolyte depletion rather than hunger. When insulin levels drop during fasting your kidneys excrete more sodium which takes potassium and magnesium with it. A simple sugar-free electrolyte powder taken with water during your fasting window eliminates these symptoms in most people within 24 hours. Look for products containing sodium, potassium, and magnesium – avoid anything with added sugar or calories.
Creatine and intermittent fasting
Creatine is one of the best intermittent fasting supplements hands down. It contains zero calories, doesn’t break your fast, and counteracts one of the main drawbacks of fasting for athletes – the potential for muscle loss during extended fasting periods. Taking 5g of creatine monohydrate during your fasting window maintains muscle creatine stores and supports performance in your training sessions regardless of when you eat.
Omega-3 and intermittent fasting
Omega-3 fatty acids are one of the most researched supplements for overall health – reducing inflammation, supporting brain function, and improving cardiovascular health. They work synergistically with intermittent fasting which also reduces inflammation markers. Always take omega-3 with your first meal of the day – the fat in your food significantly improves absorption of the omega-3 fatty acids.
Frequently asked questions
Can I take vitamins while fasting?
Most vitamins are fine during a fasting window – pure vitamin C, B vitamins, and minerals generally don’t break a fast. Fat-soluble vitamins A, D, E, and K should be taken with food for proper absorption. A general rule is to take your multivitamin with your first meal to cover all bases.
Does creatine break intermittent fasting?
No – creatine monohydrate contains no calories and does not trigger an insulin response. It is completely safe to take during your fasting window and will not break your fast or interfere with the metabolic benefits of fasting.
What should I eat to break my fast?
Break your fast with a balanced meal containing protein, healthy fats, and complex carbohydrates. A meal with 40-50g of protein is ideal after a fasting period to maximize muscle protein synthesis. This is the perfect time to take your omega-3, multivitamin, and a protein shake if needed.
How long should my fasting window be?
The most popular and well-researched protocol is 16:8 – 16 hours fasting and 8 hours eating. This is the easiest starting point for beginners. More extreme protocols like 20:4 or OMAD (one meal a day) offer no proven additional benefits for most people and are much harder to sustain long term.
Our verdict
The most valuable intermittent fasting supplements are the simplest ones – electrolytes to prevent fatigue and headaches, creatine to maintain muscle performance, omega-3 for overall health, and a quality multivitamin taken with your first meal. Skip the overpriced fasting-specific products and stick to these proven basics. Combined with a consistent fasting protocol and proper training, these intermittent fasting supplements will support your results without breaking your fast or your budget.
