The Importance of B Vitamins after weight loss surgery

B-vitamin deficiencies after weight loss surgery

B-vitamins include B6 (pyridoxine), folate (folic acid), vitamin B12 (cobalamin), B1 (thiamin), riboflavin, niacin, pantothenic acid, and biotin. These vitamins are needed by the body to support metabolism and help produce energy. B-vitamins are water-soluble, meaning that they dissolve in water and the body does not store these vitamins for later use and is excreted. Some B-vitamin deficiencies are more common than others after bariatric surgery.


Vitamin B12

Vitamin B12 is important for growth and a proper functioning nervous system. Vitamin B12 deficiency can be common after gastric bypass surgery. The surgical alteration of the digestive tract interferes with the absorption of vitamin B12. This vitamin is broken down by stomach acid in order for the vitamin to be carried through the beginning of the small intestine (duodenum) where it is then bound to something called intrinsic factor that helps with absorption that occurs at the end of the small intestine (ileum). With changes made to the stomach and bypassing most of the duodenum, cells of the stomach are unable to produce adequate amounts of intrinsic factor to help with absorption of vitamin B12. Vitamin B12 can be found in different forms of supplementation, but for some bariatric patients, sublingual B12 is a common option. This form of supplementation dissolves under the tongue to ensure absorption.

 Bariatric Fusion B12

Symptoms of B12 deficiency include anemia, constipation, fatigue, headaches, mouth lesions, and irritability.


B1 (thiamin)

Vitamin B1 is essential in helping the body convert the food you eat into energy. This vitamin is absorbed in the proximal small intestine (duodenum). After gastric bypass and sleeve gastrectomy surgery, some patients may experience nausea leading to consistent vomiting that can result in thiamin deficiency. Deficiency of vitamin B1 can also occur from caloric restriction due to a reduced stomach size and not adhering to a regular vitamin regimen causing malnutrition.

 Bariatric Fusion B1

Symptoms of B1 deficiency include confusion, digestive problems, loss of appetite, memory loss, weakness, and nervousness.


Folate (folic acid)

Folate is needed by the body for metabolic functions and red blood cell production. Folate is absorbed throughout the entire small intestine so a deficiency is usually due to a lack of folate consumed in the diet. Folate is found in fortified cereals, legumes, leafy vegetables, and other fruits and vegetables.


Symptoms of Folate deficiency include anemia, shortness of breath, headaches, fatigue, insomnia, and paranoia.



Riboflavin is utilized by the body to produce energy, assist with cellular function, and growth. Inadequate intake of riboflavin from food can result in deficiency which can be common due to  restriction of the stomach after weight loss surgery.


Symptoms of Riboflavin deficiency include blurred vision, depression, hair loss, dermatitis, loss of sensation, sleepiness, mouth lesions.



Niacin is important in carbohydrate, protein, and fat metabolism in the body. This vitamin is absorbed in the small intestine and the stomach resulting in a higher risk of deficiency in weight loss surgery patients.


Symptoms of Niacin deficiency include canker sores, confusion, irritability, loss of appetite, nausea, inflammation



For someone that is consuming a wide variety of foods, a biotin deficiency is uncommon. Following bariatric surgery, restriction and malabsorption can hinder your ability to consume a wide variety of food options which could then result in biotin deficiency.

 Bariatric Fusion Biotin

Symptoms of Biotin deficiency include hair loss, insomnia, inflammation of the eye, and dermatitis.


Pantothenic acid

Pantothenic acid assists in fatty acid synthesis. A wide variety of plant and animal foods contain this vitamin. This vitamin is absorbed in the intestines and intestinal flora can even produce small amounts of pantothenic acid in the body. In cases of malnutrition, pantothenic acid deficiencies can be seen.


Symptoms of Pantothenic acide deficiency include abdominal pains, depression, eczema, hair loss, immune impairment, nausea, and insomnia.


Vitamin B6 (pyridoxine)

Vitamin B6 is involved in many enzyme reactions and protein metabolism in the body. This vitamin is absorbed in the small intestine (jejunum). A deficiency in B6 results from malabsorption in the body and is often associated with other B-vitamin deficiencies like vitamin B12 and folate.


Symptoms of B6 deficiency include acne, anemia, arthritis, dizziness, fatigue, impaired wound healing, irritability, hair loss


B-vitamins offered at Bariatric Fusion

Bariatric Fusion offers corrective B-vitamin options for those who need an extra supplement to correct any deficiencies. These supplements include B1 (Thiamine), Biotin, Sublingual B12 (for optimal absorption), and a B-50 complex that contains all eight B-vitamins.


Check out our easy to use B Vitamins Here