Top 5 Most Important Vitamins for GLP 1 Users

Last Updated:  5/18/2026

Written By:      Sanskriti Pandey (Senior Marketing Analyst)

Reviewed By:  Sam Salia (Founder and Pharmacist)

GLP-1 medications are commonly used under medical supervision for weight-management and metabolic health goals.  Many people using these medications feel full faster, eat smaller portions, and have fewer cravings. For many users, that can be helpful. But there is another side that should not be ignored.

When food intake goes down, vitamin intake may also go down.

This is why vitamins for glp 1 users may be helpful. The goal is not to make things complicated. The goal is simple: support overall nutrient intake while appetite is lower.

Many GLP 1 users do not need a huge nutrition plan. They need a practical plan that helps them eat enough protein, stay hydrated, support normal digestive function, and help address common dietary gaps  Summit Nutritions is a top GLP-1 support manufacturer based in NJ.

Recent research supports this concern. A 2025 Frontiers in Nutrition study found that people using GLP 1 receptor agonists had lower than recommended intake of several nutrients, including vitamin A, vitamin C, vitamin D, and vitamin E. The same study also found low intake of fiber, calcium, iron, magnesium, potassium, and choline. (Frontiers)

Why Vitamins Matter for GLP 1 Users

GLP-1 medications may affect appetite and gastric emptying, which can change eating patterns.

For example, before starting a GLP 1 medication, someone may eat:

• Eggs and toast for breakfast
• Chicken salad for lunch
• Yogurt with fruit as a snack
• Salmon, rice, and vegetables for dinner

After starting a GLP 1 medication, that same person may only eat:

• Coffee in the morning
• A few bites of lunch
• Crackers when feeling nauseous
• A small dinner

That person may be eating fewer calories, but they may also be getting fewer vitamins, minerals, protein, and fiber.

A 2026 International Journal of Obesity article explained that early fullness, nausea, and food preference changes may reduce dietary variety and lower intake of nutrients such as iron, vitamin B12, vitamin D, calcium, and thiamine. (Nature)

Research Excerpts

Here are a few short excerpts from recent research that support the need for nutrition attention during GLP 1 use.

Excerpt 1

“Participants on a GLP 1RA are not meeting the DRI for several vital nutrients” through diet alone, according to a 2025 Frontiers in Nutrition study. (Frontiers)

Excerpt 2

The same study found that participants had insufficient intake of “vitamin A,” “vitamin C,” “vitamin D,” and “vitamin E.” (Frontiers)

Excerpt 3

A 2026 International Journal of Obesity article noted that GLP 1 related weight loss may involve “micronutrient depletion” and reduced dietary variety. (Nature)

Excerpt 4

The same article stated that structured nutrition support is important because current GLP 1 care often has limited ongoing nutrition oversight. (Nature)

Top 5 Important Vitamins for GLP 1 Users

Based on recent research, this topic works better as a top 5 blog rather than only top 3. Several vitamins may be important for GLP 1 users because lower appetite can reduce the variety and amount of food eaten.

The top 5 glp 1 vitamins to pay attention to are:

• Vitamin D
• Vitamin B12
• Vitamin B1, also called thiamine
• Vitamin C
• Vitamin E

These vitamins are not chosen randomly. These vitamins are commonly discussed because they play roles in normal nutrient intake, energy metabolism, muscle function, bone health, and immune function.

1. Vitamin D

Vitamin D is one of the most important vitamins for glp 1 users because it supports bones, muscles, immune health, and calcium absorption.

Many adults already have low vitamin D intake. GLP 1 users may have an even harder time getting enough if they eat less dairy, fewer fortified foods, fewer eggs, and less fatty fish.

The 2025 Frontiers in Nutrition study found that Vitamin D intake was very low among GLP 1 users. The average intake was 4 mcg per day, which was below the recommended intake used for comparison in the study. The study also reported that only 1.4 percent of participants met at least 100 percent of the recommended intake for vitamin D. (Frontiers)

Why Vitamin D matters

Vitamin D helps the body absorb calcium. This may be relevant during weight-management programs where bone and muscle health should be considered. If a person is losing weight but not eating enough vitamin D, calcium, protein, and minerals, the body may not get enough support for healthy bones and muscles.

Vitamin D also plays a role in immune function. Many people think of Vitamin D only for bones, but it is also part of overall wellness.

Why GLP 1 users may fall short

GLP 1 users may get less vitamin D because they may eat smaller portions of:

• Salmon
• Sardines
• Tuna
• Egg yolks
• Fortified milk
• Fortified plant milk
• Fortified yogurt
• Fortified cereals

Some users also avoid richer foods because they feel heavy in the stomach. This can make fatty fish, eggs, and dairy less appealing.

Easy food examples

A GLP 1 user does not need a large meal to improve Vitamin D intake. Small, simple choices may help.

Examples include:

• One boiled egg with whole grain toast
• Greek yogurt with berries
• Fortified milk in a smoothie
• A small piece of salmon with soft cooked vegetables
• Fortified plant milk with protein powder
• Tuna salad in a small wrap

Practical example

Someone who cannot eat a full breakfast may still tolerate a small smoothie made with fortified milk, protein powder, and a banana. This may provide more nutrition than coffee alone.

Friendly takeaway

Vitamin D is a key glp 1 vitamin because it supports bones, muscles, and immune health. GLP 1 users should consider asking their healthcare provider if vitamin D testing is appropriate, especially if they have limited sun exposure, restricted dietary intake, or have previously been advised to monitor vitamin D.

2. Vitamin B12

Vitamin B12 supports nerve health, red blood cell formation, energy metabolism, and brain function. It is especially important for people who eat less animal protein after starting a GLP 1 medication.

Vitamin B12 is mostly found in animal based foods and fortified foods. If someone eats less meat, fish, eggs, and dairy, B12 intake may drop.

The 2026 International Journal of Obesity article listed vitamin B12 as one of the essential nutrients that may be reduced when GLP 1 users experience early fullness, nausea, food preference changes, and lower dietary variety. (Nature)

Why Vitamin B12 matters

Vitamin B12 helps the body make healthy red blood cells. It also supports nerves. Vitamin B12 plays a role in normal nerve function, red blood cell formation, and energy metabolism. Anyone concerned about B12 status should speak with a healthcare professional. These symptoms can have many causes, so testing and medical guidance are important.

Why GLP 1 users may fall short

Some GLP 1 users naturally shift toward lighter foods. For example, they may choose crackers, toast, fruit, soups, or small snacks because heavier meals do not feel good.

That may reduce intake of B12 rich foods such as:

• Eggs
• Fish
• Chicken
• Beef
• Milk
• Yogurt
• Cheese
• Fortified foods

This can matter even more for people who follow vegetarian or mostly plant based diets.

Easy food examples

Helpful B12 food options may include:

• Eggs
• Greek yogurt
• Cottage cheese
• Salmon
• Tuna
• Chicken
• Lean beef
• Fortified cereal
• Fortified nutritional yeast
• Fortified plant milk

Practical example

A person may not be able to eat a large chicken meal while using a GLP 1 medication. But they may tolerate a small meal with Greek yogurt, berries, and fortified cereal. That small meal can support B12 intake and also provide protein.

Friendly takeaway

Vitamin B12 is one of the most useful vitamins for glp 1 users to watch, especially when appetite is low or animal protein intake drops.

3. Vitamin B1, Also Called Thiamine

Vitamin B1, also called thiamine, helps the body turn food into energy. It also supports the nervous system.

Thiamine is important because people using GLP 1 medications may sometimes eat much less than before. Some may also experience nausea or vomiting, especially during dose increases. When intake is very low for a period of time, thiamine status becomes more important.

The 2026 International Journal of Obesity article included thiamine among nutrients that may be affected by reduced dietary variety and low oral intake in GLP 1 users. (Nature)

Why Vitamin B1 matters

Thiamine helps the body use carbohydrates for energy. It is also involved in normal nerve function.

If someone is eating very little, skipping meals often, or relying mostly on plain foods, thiamine intake may become low. This is why nutrition quality matters, not just calorie reduction.

Why GLP 1 users may fall short

Vitamin B1 may become more important when a person:

• Eats very small meals
• Skips meals because of low appetite
• Has nausea or vomiting
• Avoids grains, beans, and legumes
• Eats mostly plain crackers, toast, or broth
• Loses weight quickly without a balanced meal plan

Easy food examples

Good thiamine food sources may include:

• Oats
• Brown rice
• Whole grain bread
• Beans
• Lentils
• Sunflower seeds
• Pork
• Fortified cereals
• Peas
• Nuts

Practical example

If someone feels too full for a large meal, a small bowl of oatmeal with peanut butter may be more helpful than plain toast. It can provide thiamine, fiber, some protein, and healthy fats.

Friendly takeaway

Vitamin B1 may not be the first vitamin people think about, but it matters for GLP 1 users because low intake, nausea, vomiting, and rapid weight loss can make nutrition gaps more likely.

4. Vitamin C

Vitamin C supports immune health, collagen formation, skin health, antioxidant protection, and iron absorption.

It is also one of the vitamins that may drop when people eat fewer fruits and vegetables.

In the 2025 Frontiers in Nutrition study, vitamin C intake was below the recommended intake used for comparison. The study reported an average vitamin C intake of 51 mg per day among participants using GLP 1 receptor agonists. (Frontiers)

Why Vitamin C matters

Vitamin C helps the body make collagen. Collagen is important for skin, connective tissue, and normal wound healing. Vitamin C also helps the body absorb non heme iron, which is the type of iron found in plant foods.

This can matter for GLP 1 users because the same study also found low intake of iron and several other nutrients. (Frontiers)

Why GLP 1 users may fall short

A person using GLP 1 medication may eat fewer fruits and vegetables because:

• Raw vegetables feel too heavy
• Large salads are hard to finish
• Acidic fruits may feel uncomfortable
• Nausea makes fresh produce less appealing
• Smaller meals leave less room for side dishes

The Frontiers in Nutrition study also found that participants did not meet recommended daily servings for fruit, vegetables, grains, or dairy. (Frontiers)

Easy food examples

Good vitamin C food sources may include:

• Oranges
• Strawberries
• Kiwi
• Bell peppers
• Broccoli
• Brussels sprouts
• Tomatoes
• Potatoes
• Pineapple
• Mango

Practical example

A full salad may feel like too much for someone using a GLP 1 medication. But they may tolerate:

• Half a kiwi
• A few strawberries
• Tomato soup
• Soft cooked broccoli
• A small smoothie
• Bell pepper strips with hummus

Small portions can still help when they are chosen consistently.

Friendly takeaway

Vitamin C is one of the most practical glp 1 vitamins because it is easy to add through small servings of fruit and vegetables.

5. Vitamin E

Vitamin E is a fat soluble antioxidant. It helps support protection of cells from oxidative stress.

The 2025 Frontiers in Nutrition study found that vitamin E intake was below the recommended intake used for comparison. The average intake was 9.6 mg per day. (Frontiers)

Why Vitamin E matters

Vitamin E supports cell health and immune function. It is found in foods that contain healthy fats, such as nuts, seeds, avocado, and certain oils.

This is important because some GLP 1 users avoid higher fat foods because those foods may feel heavy or worsen nausea. But avoiding all healthy fats may reduce vitamin E intake.

Why GLP 1 users may fall short

Vitamin E intake may drop when someone eats less of foods such as:

• Almonds
• Sunflower seeds
• Peanut butter
• Avocado
• Spinach
• Olive oil
• Hazelnuts
• Wheat germ

Some GLP 1 users may also reduce meal size so much that they skip toppings and side foods that usually provide vitamin E.

Easy food examples

Simple ways to add vitamin E include:

• Add a small spoon of peanut butter to a smoothie
• Add a few almonds to Greek yogurt
• Add avocado to eggs
• Add sunflower seeds to oatmeal
• Add olive oil to cooked vegetables
• Add spinach to soup or eggs

Practical example

A large high fat meal may not feel good for some GLP 1 users. But a small amount of healthy fat may be easier to tolerate. For example, adding a few almonds to yogurt can support vitamin E without making the meal too heavy.

Friendly takeaway

Vitamin E is one of the important vitamins for glp 1 users because reduced food intake and lower healthy fat intake may make it harder to get enough.

Should GLP 1 Users Take a Multivitamin?

A multivitamin may be worth discussing with a healthcare professional for some GLP-1 users, especially when regular meals are difficult to maintain.

This does not mean every person needs the same supplement. It also does not mean supplements should replace food. But a complete multivitamin can be a practical support when food intake is limited.

The 2026 International Journal of Obesity article stated that, because formal nutrition screening guidance for GLP 1 users is still limited, a once daily complete multivitamin and mineral supplement may be a practical interim strategy. (Nature)

A multivitamin may be worth discussing when someone:

• Eats much less than before
• Skips meals often
  
• Avoids many food groups
• Eats fewer fruits and vegetables
• Eats little protein
  
• Has a history of low vitamin D, B12, iron, or other nutrients

A multivitamin should not replace a balanced plan

A supplement may help fill gaps, but it cannot fully replace protein, fiber, hydration, and balanced meals.

GLP 1 users should still focus on:

• Protein at each meal
• Fruits and vegetables in small portions
• Fiber rich foods
• Healthy fats in small amounts
• Enough fluids
• Regular medical follow up when needed

Food First Nutrition Plan for GLP 1 Users

The best plan is usually simple. GLP 1 users may do better with smaller, nutrient dense meals instead of large meals.

Step 1: Start with protein

Protein is important during weight loss because it helps support muscle. The Frontiers in Nutrition study found that protein intake as grams per kilogram per day was below higher protein needs for weight loss support in many participants. (Frontiers)

Protein examples include:

• Eggs
• Greek yogurt
• Cottage cheese
• Chicken
• Fish
• Turkey
• Tofu
• Lentils
• Protein shakes
• Protein smoothies

Simple example

Instead of eating only toast for breakfast, a GLP 1 user may add eggs or Greek yogurt. This can make the meal more nourishing without making it too large. heck out our fiber, collagen, protein, electrolytes, and vitamins-packed GLP-1 powder blend for your total support!

Step 2: Add colorful fruits and vegetables

Fruits and vegetables can help provide vitamin C, vitamin A, potassium, magnesium, fiber, and antioxidants.

Examples include:

• Strawberries
• Kiwi
• Oranges
• Bell peppers
• Tomatoes
• Spinach
• Broccoli
• Carrots
• Sweet potato

Simple example

If a large salad feels too much, choose soft cooked vegetables or a small smoothie.

Step 3: Add smart carbohydrates

Carbohydrates are not bad. The key is choosing better carbohydrates in portions the person can tolerate.

Examples include:

• Oats
• Brown rice
• Beans
• Lentils
• Quinoa
• Sweet potato
• Whole grain toast
• Fortified cereal

Simple example

A small bowl of oatmeal with peanut butter can provide thiamine, fiber, and healthy fats.

Step 4: Add small healthy fats

Healthy fats help with fullness and can support intake of fat soluble vitamins, including vitamin E.

Examples include:

• Avocado
• Olive oil
• Almonds
• Peanut butter
• Sunflower seeds
• Chia seeds
• Flaxseed

Simple example

A GLP 1 user may not tolerate a greasy meal, but they may tolerate a small amount of avocado with eggs or a few almonds with yogurt. Check out our mango-pineapple flavored gummies for total support related to GLP-1!

Simple Meal Examples for GLP 1 Users

Small breakfast idea

• Greek yogurt 
• Strawberries
• Fortified cereal
• A few almonds

This meal can support protein, vitamin C, vitamin B12, vitamin E, and minerals.

Small lunch idea

• Scrambled eggs
• Whole grain toast
• Tomato slices
• Avocado

This meal can support vitamin B12, thiamine, vitamin C, vitamin E, protein, and healthy fats.

Small dinner idea

• Salmon
• Soft cooked broccoli
• Brown rice
• Olive oil drizzle

This meal can support vitamin D, vitamin C, protein, minerals, and healthy fats.

Gentle snack idea

• Fortified milk or fortified plant milk
• Protein powder
• Banana
• Peanut butter

This may help someone who cannot tolerate a full meal.

Light nausea friendly idea

• Whole grain toast
• Egg
• Ginger tea
• Small fruit serving

This can feel simple while still adding more nutrition than crackers alone.

Where Summit Nutritions Fits

For people looking for simple daily wellness products to complement a balanced nutrition routine, Summit Nutritions offers convenient options that may help support everyday nutrient intake.

Explore Summit Nutritions wellness products here:
https://summitnutritions.com/collections/glp-1-total-support

These products are not intended to replace a balanced diet, medical care, or guidance from a healthcare professional.

Signs a GLP 1 User May Need Nutrition Support

A person should speak with a healthcare provider if they notice:

• Ongoing fatigue
• Dizziness
• Weakness
• Hair shedding
• Muscle loss
• Numbness or tingling
• Very low appetite
• Frequent vomiting
• Constipation that does not improve
• Trouble eating enough protein
• Trouble eating fruits and vegetables
• Rapid weight loss with poor food intake

These symptoms do not always mean a vitamin deficiency. But they are a reason to look more closely at food intake, hydration, protein, and possible lab testing. 

Common Mistakes GLP 1 Users Should Avoid

Mistake 1: Eating too little for too long

Eating less may be part of weight loss, but eating too little for too long can make it harder to meet vitamin and protein needs.

Mistake 2: Drinking coffee instead of breakfast

Coffee may feel easy, but it does not provide protein, vitamins, or minerals. Even a small yogurt, egg, or smoothie can be a better start.

Mistake 3: Avoiding all fats

Greasy foods may cause discomfort for some people, but small amounts of healthy fats can support vitamin E intake and overall nutrition.

Mistake 4: Forgetting protein

Protein matters for muscle support during weight loss. A small meal with protein is usually more useful than a larger meal made mostly of low nutrient snacks.

Mistake 5: Waiting until symptoms become serious

It is better to support nutrition early instead of waiting for fatigue, weakness, or other concerns.

Final Thoughts

The best vitamins for glp 1 users are the ones that help support overall wellness while appetite is lower.

The top 5 glp 1 vitamins to watch are:

• Vitamin D for bone, muscle, calcium, and immune support
• Vitamin B12 for nerves, red blood cells, and energy metabolism
• Vitamin B1 for energy metabolism and nervous system support
• Vitamin C for immune health, collagen, and iron absorption
• Vitamin E for antioxidant and immune support

GLP 1 medications may help many people with weight management, but they should be paired with smart nutrition. Smaller meals can still be powerful when they include protein, fruits, vegetables, whole grains, healthy fats, and the right vitamin support.

A food first plan, a complete multivitamin when appropriate, and professional guidance can help GLP 1 users feel supported during their health journey. Shop our premium products today!

References

Butsch, W. S., Sulo, S., Chang, A. T., Kim, J. A., Kerr, K. W., Williams, D. R., Kyle, T. K., Christensen, S., Bollman, S., & Heymsfield, S. B. (2025). Nutritional deficiencies and muscle loss in adults with type 2 diabetes using GLP 1 receptor agonists: A retrospective observational study. Obesity Pillars, 15, Article 100186. https://doi.org/10.1016/j.obpill.2025.100186

Johnson, B., Peterson, H., Cline, M., Foster, M., & Thomas, D. T. (2025). Investigating nutrient intake during use of glucagon like peptide 1 receptor agonist: A cross sectional study. Frontiers in Nutrition, 12, Article 1566498. https://doi.org/10.3389/fnut.2025.1566498

Mozaffarian, D., Agarwal, M., Aggarwal, M., Alexander, L., Apovian, C. M., Bindlish, S., Batsis, J. A., Bays, H. E., Brown, J. D., Sacks, F. M., & others. (2025). Nutritional priorities to support GLP 1 therapy for obesity: A joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society. The American Journal of Clinical Nutrition, 122(2), 344 to 367. https://doi.org/10.1016/j.ajcnut.2025.04.023

Spreckley, M., Ruggiero, C. F., & Brown, A. (2026). Bridging the nutrition guidance gap for GLP 1 receptor agonist therapy assisted weight loss: Lessons from bariatric surgery. International Journal of Obesity, 50, 265 to 267. https://doi.org/10.1038/s41366-025-01952-w

 

This article is for educational purposes only and is not intended as medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. If you use GLP-1 medication, have a medical condition, experience ongoing symptoms, or are concerned about nutrient intake, speak with your healthcare provider before starting any supplement.