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Energy metabolism support; Cellular health; Nutritional support for methylation
Adults with busy schedules seeking an easy daily B-complex or people with low dietary intake of B-rich foods.
Adults take 1 capsule daily with food; taking B vitamins with a meal may reduce stomach upset and niacin flushing.
Non-GMO; Gluten Free; Soy Free; Vegan
Riboflavin cofactors FAD and FMN participate in mitochondrial energy reactions and antioxidant enzyme function.
Caution: High-dose B2 may cause bright yellow urine, which is harmless but can be surprising.
Methylcobalamin supports methylation reactions and red blood cell formation, which are important for energy metabolism and nervous system function.
Caution: Very high intakes may cause acne-like skin changes in some people; discuss use if you have B12 sensitivity.
Vitamin B6 forms the coenzyme PLP, which supports amino acid metabolism, neurotransmitter synthesis, and glycogen breakdown for energy.
Caution: Large amounts over time may cause tingling or numbness; do not exceed directions.
Niacin forms the cofactors NAD and NADP that drive cellular energy production and redox reactions.
Caution: Niacin may cause temporary flushing and warmth; taking with food can help minimize discomfort.
As 5-MTHF, folate donates methyl groups for DNA synthesis and methylation, supporting normal cell division and homocysteine metabolism.
Caution: If you have a history of folate or B12–related concerns, consider discussing active folate use with a healthcare professional.
Active forms of B2, B6, B12, and folate work across methylation and energy pathways: 5-MTHF and methylcobalamin drive methylation, while riboflavin and niacin supply FAD/FMN and NAD/NADP for cellular energy reactions. Together they cover coenzyme needs for carbohydrate, fat, and amino acid metabolism.
Label Warning: Do not exceed the suggested use. Consult a physician if you are hypersensitive to thiamin, niacin, or vitamin B12. Stop use and consult a physician if any adverse reaction occurs.
Who should be cautious: People with known sensitivity to B vitamins such as thiamin, niacin, or vitamin B12 may need extra caution. Those with a history of flushing from niacin may prefer to start with food and monitor how they feel.
Storage: Store in a cool, dry place.
Many users mention feeling more energetic and experiencing overall well-being after consistent use.
Capsules are frequently described as simple to take without discomfort.
A few users mention mild stomach or digestive issues.
This product is guaranteed authentic and backed by our easy returns & refunds policy. Details
Magnesium and B vitamins may support energy production and reduce fatigue, promoting overall vitality and well-being.
AI generated. Not medical advice.
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At Doctor's Best, we value the science of energy. Our Fully Active B Complex is a comprehensive blend of B vitamins that are readily available and highly bioavailable in the body. This unique formula offers optimal support for energy production, cellular health, and overall well-being.
Adult use: Take 1 capsule daily with food, or as recommended by a nutritionally informed physician.
Hypromellose (vegetarian capsule), microcrystalline cellulose, magnesium stearate (vegetable source), silicon dioxide.
Do not exceed recommended dose. Consult a physician if hypersensitive to thiamin (vitamin B1), niacin, and vitamin B12. Discontinue use and consult a physician if adverse reaction occurs.
Keep out of reach of children.
Store in a cool dry place.
While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally ship with alternate packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and not rely solely on the information provided by iHerb.
| Supplement facts | ||
| Serving Size: 1 Veggie Capsule | ||
| Servings Per Container: 30 | ||
| Amount Per Serving | %Daily Value | |
| Vitamin C (as ascorbic acid) | 40 mg | 44% |
| Thiamin (as thiamin HCl) | 60 mg | 5000% |
| Riboflavin (as riboflavin and riboflavin-5-phosphate) | 75 mg | 5769% |
| Niacin (as niacinamide and niacin) | 50 mg | 313% |
| Vitamin B6 (from pyridoxine HCl and pyridoxal-5-phosphate) | 50 mg | 2941% |
| Folate (as (6S)-5-methyltetrahydrofolic acid, glucosamine salt) (Quatrefolic®) | 400 mcg DFE | 100% |
| Vitamin B12 (as methylcobalamin) | 1000 mcg | 41677% |
| Biotin | 600 mcg | 2000% |
| Pantothenic Acid (as d-calcium pantothenate) | 100 mg | 2000% |
