Do Vitamins Break Your Fast? AVOID These 6 Supplements That Are Breaking Your Fast

Intermittent Fasting means alternating between fasting windows during which you avoid eating food, but what about your supplements and vitamins? Do vitamins break your fast? This post shares which vitamins and supplements will affect your fast, and which are safe to take. Plus: Intermittent Fasting FAQs on medicine and supplements!

If you’re reading this, you’re probably already experimenting with an Intermittent Fasting (IF) lifestyle, or seriously considering it. Well, I’M ALL FOR IT for a few of these reasons...

Intermittent Fasting can...

• help you lose weight and fat
• help you improve your body fat composition
• improve your blood glucose levels 
• help improve focus and many more benefits! 

As I discuss in my Beginner's Guide to Intermittent Fasting for Weight Loss, IF involves intentional periods of eating (called your eating window) and refraining from any food (called your fasting window).

During your fasting window, you avoid any food or drink containing calories, with a few exceptions, to allow your body time to go through autophagy (when your cells work, doing things like removing old proteins). During fasting, your body can improve blood sugar levels because of better insulin sensitivity. Studies also indicate that intermittent fasting may improve insulin response and it may help you lose weight,

But, what about supplements during your fasting window?

Let's break it down, and understand what you can safely take during your fast and what to avoid for a truly successful and effective IF journey. 

Let's get started!

What's The Difference Between Vitamins and Supplements?

The main difference between vitamins and supplements is that vitamins are micronutrients we get from food, whereas nutritional supplements are meant to "supplement" your diet, giving you nutrients that you may miss if you don't have a complete diet of all essentials.

Vitamins	Supplements
Vitamin A B Vitamins (Thiamin, Roboflavin, Niacin, Folic Acid, etc.) Vitamin C Vitamin D Vitamin E Vitamin K	Vitamins (Multivitamins) Minerals (Calcium, Magnesium, Iron, etc.) Botanical Compounds (Caffeine, Curcumin, etc.) Botanicals or Herbs (Echinacea, Ginger, etc.) Enzymes (Lipase, Papain, etc.) Amino Acids (Tryptophan, Glutamine, etc.) Live Microbials (Probiotics)

Vitamins can be a type of supplement when taken as part of the diet and are different from conventional food. They are essential for normal cell function, growth, and development. There are 13 essential vitamins, and each of them is required for the body to work properly.

Supplements cover a broader classification of products and are taken in many forms, including tablets, capsules, soft gels, gel caps, powders, bars, gummies, and liquids.

What Are The Two Types Of Vitamins?

Vitamins are divided into two categories. These are:

1. Fat-Soluble Vitamins: These types of vitamins are stored in the body's liver, fatty tissue, and muscle. Included in this category are Vitamins A, D, E, and K. These should be taken with foods containing fat for your body to better absorb them.
2. Water-Soluble Vitamins: There are nine of these type of vitamins, which includes Vitamin C and all the B vitamins. These vitamins aren’t stored in your body. Excess amounts of these vitamins are excreted from the body through the urine. Water-Soluble Vitamins have to be consumed regularly to prevent deficiencies (except for Vitamin B12, which can be stored in the liver for many years).

Now that we understand the difference between vitamins and supplements, and the different types of each, let's discuss which vitamins and/or supplements will break a fast.

Will Taking Vitamins Or Supplements Break My Fast?

This answer is not always black or white. I say that because in general, supplements that cause an insulin response or that have any calories at all may break your fast. The first thing that comes to mind for me is gummy vitamins. They'll often contain gelatin, collagen (while this is beneficial its not if you want to fast), artificial sweeteners, or sugar which definitely stop ketosis and autophagy.

Any supplements with a coating can also break your fast as again, they can make changes to your insulin levels.

Fat-soluble vitamins should be taken with foods containing fat to be better absorbed by your body, which means they should be taken during your feeding window for better absorption. This also means water-soluble vitamins will not break a fast and are fine to take on an empty stomach, and while fasting. But it's important to note that sometimes b-complex vitamins can cause nausea if you take them on an empty stomach.

Do Supplements Ruin Intermittent Fasting?

Some supplements are not ideal to take when fasting.

As we've mentioned, during a fasting period, you should avoid any foods, including supplements, that have a high energy intake (meaning contains calories). This is almost entirely true if your purpose for fasting is for weight loss, body recomposition, and/or improved insulin resistance.

It's also important to consider whatever intermittent fasting myths you may have heard.

Let's dig a little deeper below.

Vitamins/Supplements That WILL Likely Break A Fast

The following supplements shouldn't be consumed during your fasting window:

1. Protein Powders: Protein powders generally contain about 100-150 calories, 15-25 grams of protein and 5-10 grams of carbs per serving. If you take the approach that anything that contains calories will break a fast, you're most often correct. I often enjoy a protein smoothie after a workout, not when I'm fasting.
2. Gummy Vitamins/Supplements: Gummy supplements (see my post on ACV gummies) are often made with added sugars and additives like collagen and gelatin, which contain calories.
3. Bone Broth: This one is a little tricky. In short, yes, bone broth contains between 30-50 calories per cup, and will technically break your fast. BUT even if the fast is broken, the goal of intermittent fasting is usually to put your body into a fat-burning state, and bone broth can help with this during a longer fast, which is why some say it's okay to drink in a fed or fasting state. Personally, I consider it a fast-breaker, and avoid it when fasting unless completing a bone broth fast, as my goal is not ketosis.
4. Collagen: Collagen contains approximately 30 calories per serving, and will likely break your fast. Like bone broth, while collagen does technically break a fast, it is still allowed under many keto plans due to its low-calorie profile. Also like bone broth, I prefer to leave it to feeding windows.
5. MCT Oil: While MCT oil (coconut oil is high in MCTs) does contain calories, it is absorbed differently than other types of fat. MCT oil doesn’t stimulate insulin production in the body, which means that it shouldn’t impact the body’s fat-burning capabilities. I consider it a fast-breaker.
6. Branched-Chain Amino Acid (BCAAs):  A full dose BCAA supplement contains about 4g of BCAA, so a serving would make up about 20 calories in total. Studies also show that BCAAs trigger an insulin response. If you’re strictly fasting, I recommend avoiding BCAA supplements in your fasting state.

Vitamins/Supplements That WILL Likely Break A Fast

Protein Powders

Gummy Vitamins/Coated Supplements

Bone Broth

Collagen

MCT Oil

Branched-Chain Amino Acids (BCAAs)

If you want to learn more about what you can have during your fast, check out my Beginner’s Guide to Intermittent Fasting. Luckily, IF is flexible so you can always choose a schedule that suits you! 

More Helpful Posts On Intermittent Fasting

Looking to level up your IF game? Here’s all I’ve learned throughout my journey: 

• What Is Intermittent Fasting? | Can It Help You Lose Weight?
• Why Am I GAINING Weight With INTERMITTENT FASTING: 4 Intermittent Fasting Mistakes That Can Lead To Weight Gain
• 9 Intermittent Fasting Mistakes Beginners Make (And How To Avoid Them!)
• Intermittent Fasting Meal Plan | How To Create Your Eating Routine
• Intermittent Fasting For Women: A Complete Guide