Folbee is a prescription B vitamin supplement used primarily to lower high homocysteine levels in the blood. Each tablet contains three active ingredients: 2.5 mg of folic acid, 25 mg of vitamin B6, and 1 mg of vitamin B12. These three vitamins work together to help your body break down homocysteine, an amino acid that can damage blood vessels when it builds up.
Why Homocysteine Levels Matter
Homocysteine is a naturally occurring amino acid your body produces as part of normal protein metabolism. At healthy levels, it’s harmless. But when levels climb too high, a condition called hyperhomocysteinemia, it becomes a risk factor for cardiovascular disease, stroke, and kidney problems. Your body depends on three specific B vitamins to keep homocysteine in check, and a shortage of any one of them can cause levels to rise.
Folbee supplies all three of those vitamins in doses well above what you’d get from a typical diet or a standard multivitamin. The goal is to give your body enough raw material to efficiently clear homocysteine from your bloodstream through two different biological pathways.
How the Three Vitamins Work Together
Your body has two main routes for getting rid of excess homocysteine, and each route relies on different B vitamins. In the first pathway, homocysteine gets recycled back into methionine, a useful amino acid. This conversion requires folic acid as the primary ingredient and vitamin B12 as a helper molecule. Without enough of either, the recycling stalls and homocysteine accumulates.
The second pathway takes a different approach: instead of recycling homocysteine, it breaks it down permanently into other compounds your body can use. This breakdown process depends on vitamin B6. By combining all three vitamins in a single tablet, Folbee supports both pathways simultaneously, which is more effective than supplementing just one vitamin alone.
Cardiovascular and Stroke Protection
Lowering homocysteine isn’t just a lab number exercise. Elevated homocysteine is linked to a higher risk of heart attack and stroke, and research suggests that folic acid supplementation can meaningfully reduce that risk in certain populations. In a large trial involving over 20,000 adults with high blood pressure, adding folic acid to their treatment reduced the risk of first stroke by a significant margin. Among participants with high cholesterol, stroke rates dropped from 4.0% to 2.7% with folic acid supplementation, a 31% reduction in risk.
A broader analysis pooling data from 15 randomized controlled trials found that folic acid supplementation reduced stroke risk by about 8% on average across diverse populations. The benefit appears strongest in people who have elevated homocysteine to begin with and in countries that don’t add folic acid to the food supply through fortification programs.
Use in Kidney Disease
People with chronic kidney disease often develop elevated homocysteine because their kidneys are less efficient at clearing it. Research from the China Stroke Primary Prevention Trial found that folic acid supplementation slowed kidney disease progression, with a particularly strong effect in people who already had reduced kidney function at the start of the study. In that subgroup, the absolute risk of disease progression dropped by 3.5 percentage points, meaning roughly one in every 29 patients treated with folic acid avoided worsening kidney function over about four and a half years of follow-up.
The study also confirmed that folic acid supplementation was safe for people with kidney disease, which had been an open question. While Folbee specifically hasn’t been the subject of these large trials, its combination of folic acid, B12, and B6 targets the same biological pathways studied in the research.
Common Side Effects
Most people tolerate Folbee well. The side effects that do occur tend to be mild and digestive in nature: upset stomach, diarrhea, and headache are the most frequently reported. Some people experience drowsiness or itching. These effects typically resolve on their own and rarely require stopping the supplement.
Serious reactions are uncommon but can include signs of an allergic response such as rash, hives, swelling of the face or throat, or difficulty breathing. Unusual tingling, burning, or numbness sensations should also be reported promptly. Folbee should not be taken by anyone with Leber’s optic atrophy, a rare inherited eye condition, because vitamin B12 can worsen vision loss in that disease. It can also interact with levodopa, a medication used for Parkinson’s disease, so your prescriber needs to know about any medications you’re currently taking.
Who Typically Gets Prescribed Folbee
Folbee is most commonly prescribed for people with confirmed high homocysteine levels, whether from blood testing, genetic factors, dietary deficiency, or as a consequence of another condition like kidney disease. It’s also sometimes used alongside certain chemotherapy drugs that deplete B vitamins, or for people with absorption issues that make it difficult to get adequate B vitamins from food alone. The doses in Folbee are significantly higher than what you’d find in an over-the-counter B complex, which is why it’s available by prescription rather than as a standard supplement.