Can Vitamins Kick You Out of Ketosis?

If you’re following a ketogenic diet, even small details can matter. It’s not just obvious carbs you need to think about.

Many people worry that something as simple as daily vitamin and mineral supplements could contain hidden ingredients that might affect ketosis.

So, can vitamins kick you out of ketosis?

In most cases, no. Standard vitamin tablets and capsules contain little to no carbohydrates and won’t disrupt ketosis.

However, certain formats, such as gummy vitamins, flavoured powders, or supplements with added fillers, can contain small amounts of sugar or fast-digesting carbs that may have an impact, depending on how strict your approach is.

Here’s what to watch out for, and how to choose supplements that support your goals.

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What Is Ketosis on a Keto Diet?

Ketosis is a metabolic state whereby levels of blood ketones are high, and the body relies on fat for fuel rather than carbohydrates; it produces ketone bodies from fat to supply energy due to limited access to glucose.

Here’s how it happens:

After a prolonged period of reduced dietary carbohydrate intake, glucose levels become depleted and are no longer sufficient for normal fat oxidation to occur or to supply the brain and nervous system with fuel.

Because free fatty acids are unable to cross the blood-brain barrier, they cannot supply a source of energy for the brain. Thus glucose is the preferred source of fuel.

With minimal glucose coming in through diet, the body has to find another source: fats. This is where the weight loss comes from. (1)

Energy is supplied to the body through three main ketone bodies: acetoacetate beta-hydroxybutyrate (BHB), and acetone, which are generated through a process called ketogenesis that occurs mainly in the liver. (2)

When blood sugar levels decrease, insulin levels do as well, which triggers the release of stored fatty acids. These fatty acids are what are converted to ketones by the liver and supply the body with energy. (3)

And interestingly enough, using ketone bodies creates greater amounts of energy than glucose anyway because of greater mitochondrial ATP production!

That’s why increased energy is one of the benefits of being in ketosis.

How Do I Get Into Ketosis?

Getting into ketosis can be challenging for some people and easy for others.

It’s primarily dependent on diet, but other things like exercise, stress, and supplementation can also play a role. Maintaining adequate electrolytes, such as sodium, potassium, and magnesium, is crucial during ketosis and can help prevent side effects like headaches and fatigue. (4)

Here are the best ways to get into ketosis:

1. Cut Back on Carbs

Carbs are the single biggest factor in your ability to get into ketosis.

If you’re consuming too many carbs, even in the form of starchy vegetables, your glucose levels are going to be too high for your body to switch over to burning fat for fuel.

But keep in mind that net carb values aren’t going to be the same for everyone. Your carb intake is going to depend on 3 factors:

1. Your activity levels

2. Your current body composition (body fat %)

3. Overall caloric needs

As a general rule, carbs should comprise around 5-10% of your total calories, which should be anywhere from 20-50g net carbs; net carbs is total carbohydrate content minus fiber content. (5)

2. Exercise

Physical activity can speed up your entry into ketosis because it depletes existing glucose stores that much faster.

Prolonged exercise or slower-paced endurance activities like cycling, swimming, or running are a great way to deplete glycogen stores. Increased physical activity can also lead to greater electrolyte loss, and electrolyte supplementation is often recommended to prevent 'keto flu' symptoms.

Keep in mind that some exercises, such as power-lifting or any heavy resistance training, may require a more substantial intake of carbs. In situations like these, cyclical low-carb may be more suitable than full on ketosis.

*Check out our 4 Tips for Working Out at Home here.

3. Take Some MCTs

As we’ve talked about before, MCT is a staple for people on keto or low-carb. Coconut oil is a popular source of MCTs and can help accelerate ketosis and support digestive comfort. Because of its ability to bypass the digestive system and directly enter portal circulation, it can be converted to ketones immediately and used to supply energy.

And unlike carbohydrates, MCT doesn’t impact your blood sugar and insulin levels.

This rapid conversion may just give you the boost you need to get into ketosis. (6)

*If you’re interested, check out our article on the Best MCT Oil here.

4. Try Intermittent Fasting

Need to deplete your glycogen stores quickly? Fasting will do it.

Fasting anywhere from 24 hours to 3 days is the ultimate way to deplete glycogen stores and help your body switch to ketone production.

However, if you’ve ever tried fasting for more than one day, you know how challenging it can be.

Fasting for shorter periods of time (up to 24 hours) is just as effective at depleting glycogen if you’re starting a low-carb or ketogenic diet. (7)

When taking vitamins during intermittent fasting, prioritize taking vitamins with meals to aid absorption and reduce stomach upset. For longer periods of fasting, consider water soluble vitamins. (8)

See our article on the Best Fat Burner for Intermittent Fasting here or our Best Pre-Workout for Intermittent Fasting article here.

What Prevents you From Getting Into Ketosis?

Of course, the single biggest thing that prevents you from getting into ketosis is carbs.

While carbs aren’t the enemy for a lot of people, if you’re going keto, they are.

Carbs supply glucose, and if there is glucose coming into the body, why would it need to switch over to burning fat?

Given a plate of carbs and a plate of glucose, the brain will always choose glucose.

That’s why if you blow past your 50g net carb max (or whatever your carb target is), you’re going to get kicked out of ketosis.

While vitamins themselves do not interfere with ketosis, some vitamin supplements may contain hidden carbohydrates in the form of fillers, which can disrupt ketosis if not carefully checked.

Protect your Digestive Health on Keto

Maintaining a healthy digestive system while following a low carb diet like the ketogenic lifestyle is essential. Because the keto diet is a high fat diet, moderate in protein, and very low in carbohydrates, it often means cutting out many fiber-rich foods, such as whole grains, fruits, and legumes, that support regular digestion.

These changes in your eating habits can also impact your gut bacteria, since many beneficial microbes thrive on the fibers found in higher-carb foods. (9, 10)

To support digestive health while staying in ketosis, focus on including plenty of low-carb vegetables and leafy greens (keto friendly foods) such as spinach, kale, zucchini, and broccoli. Staying hydrated is also important.

Some people find that adding digestive enzymes or magnesium supplements can support smoother digestion and reduce discomfort, especially as your body adapts to metabolizing more fats and fewer carbs.

But What About Vitamin Supplements...Can They Kick Me Out of Ketosis?

Vitamins and minerals are inherently pure compounds, and because of that, they shouldn’t interfere with ketosis.

However, the problem lies with cheap, crappy supplements that are loaded with fillers.

And what is that filler you may ask? Carbs.

Things like dextrin and maltodextrin are the most common carb-based fillers you’ll see in capsules, which are a form of simple sugars. Other options are things like vitamin gummies or protein powders, which often contain added sugars or added carbs.

But be mindful that even if your supplement capsules do contain carbs as fillers, unless you’re downing an entire bottle - which is never ever recommended - chances are that it’s still not going to be enough to impact being in ketosis or not.

Regardless of the supplements you take - be it vitamins and minerals, protein powders, energy boosters, or the like - thoroughly read the label and understand what’s in it before you take it.

If you aren’t sure what an ingredient is, do your research and see if there’s any potential for it to interfere with ketosis.

While the vitamins themselves aren’t the issue, the way supplements are formulated can make a difference.

Which Supplements May Affect Ketosis?

While most vitamin supplements won’t interfere with ketosis, the formulation and format can make a difference.

In many cases, it’s not the vitamins themselves that impact ketosis, but the added ingredients used to deliver them, especially those that may trigger a blood sugar or insulin response.

Here are the main types to be aware of:

Gummy Vitamins

These are often made with glucose syrup, sugar, or other sweeteners to improve taste. Even small amounts of sugar can contribute to your daily carb intake and may affect ketosis if taken regularly.

Flavoured Powders and Drink Mixes with Added Sugars

Some electrolyte blends or vitamin powders include added carbohydrates or sweeteners, which can increase their overall carb content.

Liquid Supplements with Hidden Carbs

Certain liquid formulas use syrups or sweeteners, which can add hidden carbs compared to capsule-based alternatives.

Supplements with Fillers

Ingredients like maltodextrin or dextrin are sometimes used as bulking agents. These are rapidly absorbed and can raise blood glucose levels more quickly than expected. (11, 12)

In most cases, the amount of carbohydrates is small and unlikely to have a significant effect on its own. However, when combined across multiple supplements or alongside other hidden sources of carbs, it can make it harder to maintain strict ketosis.

For this reason, many people following a ketogenic diet choose supplements with minimal additives and no unnecessary sugars or fillers.

Do Vitamins Break a Fast?

Most standard vitamin capsules and tablets contain negligible calories and are unlikely to interrupt fasting or ketosis.

However, certain forms, such as gummy vitamins, flavoured powders, or liquid supplements, may contain sugar or other additives that could technically break a fast.

For fat-soluble vitamins like vitamin D, absorption is improved when taken with food, so timing may matter depending on your fasting goals.

In general, if your goal is metabolic health or fat burning, most capsule-based vitamins won’t interfere with your fast.

Learn more: How do vitamins affect ketosis?

Best Vitamins for Fasting and Keto

When following a ketogenic diet or intermittent fasting, the form and ingredients of your supplements matter just as much as the nutrients themselves. Choosing the right keto diet vitamins can help you maintain ketosis and stay consistent without worrying about hidden carbs or fillers.

Look for supplements that are:

• Zero sugar or sugar-free versions – avoid hidden sugars disrupting ketosis or breaking a fast

• Capsule-form– ensures you’re not ingesting unnecessary sweeteners or fillers

• Free from unnecessary additives – keeps your routine clean and predictable

By focusing on clean, minimal-ingredient formulations, you can support your nutritional needs while staying aligned with your fasting or keto goals.

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If you’re taking any of the Performance Lab lineup, being kicked out of ketosis shouldn’t even register on your mind.

Performance Lab supplements adhere to the highest quality standards with the cleanest delivery.

They are always: 

• non-GMO
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And if that wasn’t enough, every supplement is encased in our very own ultramodern 100% plant-based capsule made from pullulan (fermented tapioca), so NutriCaps® are clean, prebiotic-infused, and easy to digest.

Performance Lab® also shows all ingredient dosages and forms right on the label.

We never use proprietary blends that hide dosages or sneak in ingredients. We want you to know exactly what you’re putting in your body.