Folic acid

Folic acid, or vitamin B9, is involved in the synthesis of DNA, amino acids, and other important molecules. A deficiency of folic acid can lead to decreased energy levels, digestive issues, and deterioration of overall health. To maintain an optimal level of vitamin B9 on a keto diet, it is recommended to consume vegetables such as spinach, broccoli, avocado, as well as eggs, nuts, and seeds.

Form And Absorption

For vitamins and active forms, food source, supplement form and lab marker should be separated. Absorption depends on digestion, bile flow, gut status, medications, alcohol and pre-existing deficiency.

How To Use It In Diet

On keto and LCHF, deficiencies are more often linked with monotonous eating than with carbohydrate restriction itself. Meat, fish, eggs, liver, greens, fermented foods and targeted supplements based on labs are safer than random high doses.

When Testing Helps

Testing is especially useful with fatigue, anemia, neurological symptoms, hair loss, cycle disruption, pregnancy, gastrointestinal disease, metformin, acid-suppressing medication or after bariatric surgery. It helps separate true deficiency from the wish to take “something for energy”.

What To Avoid

Starting several high-dose supplements at once is unhelpful because benefit, side effects and interactions become hard to understand. Fat-soluble vitamins, active B-vitamin forms, iron and iodine require particular care because excess can also cause problems.