Megasorb B-Complex '50'

Megasorb B-Complex '50'

Solgar4.8 (1,241 ratings)
Format:Tablet Quantity: 100 Tablet(s) · 142 servings
Goals

Product analysis

67 out of 100

Megasorb B-Complex '50' can help fill B-vitamin gaps linked with tiredness and support normal energy metabolism.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality64

Several B-vitamin forms support a favorable view of ingredient quality. Missing forms and undisclosed mixture proportions leave parts of the wider formula harder to judge.

Ingredient Transparency73

Individual amounts and most ingredient forms are stated. Several forms and the proportions of the nutrient mixtures are not disclosed, limiting a full comparison.

Value For Money54

Value is favorable for riboflavin and B6, but weaker for vitamin B5, choline and thiamin. Several other ingredients cannot be compared reliably on value, leaving a mixed picture for the combination.

Customer Satisfaction84

Customer ratings are very positive. A substantial number of ratings provides a useful picture of satisfaction, without proving an energy boost.

Product Focus65

The B-vitamin combination supports normal energy metabolism and can help with tiredness caused by low intake. Higher amounts do not establish extra energy or faster calorie burning when nutritional needs are already met.

Format
Tablet
Container
100 Tablet(s)
Per serving
$0.12
Customer rating
4.8 · 1,241 ratings
Report analysis

Goals

Impact
High effect
A- Ingredient FitF PathwaysB EvidenceA+ Formulation Logic
Vitamin B5 · 55 mgMagnesium · 24 mgRiboflavin · 55 mgThiamin · 50 mgVitamin B12 · 50 mcg

The B vitamins support normal energy metabolism, while folate supports blood cell formation. Addressing low intake of riboflavin, niacin, folate, B6 or B5 can help with associated tiredness. Higher amounts do not establish extra energy when intake is adequate. The supplied B12 amount is below the saved calculation’s inclusion threshold, which does not mean it is nutritionally ineffective. Its small magnesium amount also falls below that threshold.

How this product is rated for Energy

Ingredient fit88

Six B vitamins contribute; B12 remains below the amount required for inclusion in the saved finding.
Goal fit
Six B vitamins contribute; B12 remains below the amount required for inclusion in the saved finding.
Dose adequacy
The included B-vitamin amounts contribute strongly; the smaller magnesium and B12 amounts remain excluded.

Pathways0

The B-vitamin contribution concerns nutrient sufficiency rather than the five evaluated energy routes.
Depth
None of the five evaluated energy routes receives coverage; nutrient sufficiency is handled separately.
Breadth
No evaluated route reaches the required coverage level.

Evidence78

Riboflavin leads the evidence finding, and all six included ingredients match studied preparations.
Evidence strength
Vitamin B2 (Riboflavin) leads the saved evidence finding, subject to the specific limitations described above.
Studied preparation
Riboflavin leads the evidence finding, and all six included ingredients match studied preparations.

Formulation logic100

The included ingredients do not require an unmet partner, and no configured conflict was detected.
Partner coverage
No required partner is missing for the included ingredients.
Conflicts
No configured ingredient conflict was detected.
Effective doses
All 6 included ingredients meet the saved minimum amount threshold; that threshold does not prove fatigue relief.
Study evidence
Magnesium Supportive 4 studies
Thiamin Disputed 12 studies
Impact
High effect
B+ Ingredient FitF PathwaysA+ EvidenceA+ Formulation Logic
Biotin · 50 mcgNiacin · 50 mgVitamin B12 · 50 mcgRiboflavin · 55 mgThiamin · 50 mgVitamin B5 · 55 mgVitamin B6 · 55 mgMagnesium · 24 mg

B vitamins help normal energy-yielding metabolism, but extra intake has not been shown here to raise whole-body calorie expenditure above adequate nutrition. Their declared amounts receive saved contributions without establishing a direct thermogenic effect or sustained weight loss.

How this product is rated for Metabolism Support

Ingredient fit81

The saved findings count nutrient amounts, principally B vitamins. Normal energy metabolism does not establish an increase in calorie expenditure.
Goal fit
Other actives broaden the formula beyond this goal, reducing its focus.
Dose adequacy
The known amounts provide partial support in the saved comparison, without establishing a proven thermogenic dose.

Pathways0

No configured thermogenic function receives a contribution from these ingredients.
Depth
No configured thermogenic function receives a contribution.
Breadth
No function reaches the saved breadth threshold.

Evidence100

Vitamin B1 (Thiamin) is the strongest saved evidence contributor. The supplied scientific context does not establish a routine increase in calorie expenditure.
Evidence strength
Vitamin B1 (Thiamin) supplies the strongest saved evidence contribution; this does not override limitations in the direct energy-expenditure findings.
Studied preparation
The counted amounts match preparations accepted in the saved comparison.

Formulation logic100

The counted ingredients can contribute independently and no configured conflict is found. Their known amounts pass the saved minimum.
Partner coverage
The counted ingredients can contribute independently or have the required partner.
Conflicts
No configured ingredient conflict was identified in the supplied facts.
Effective doses
The counted amounts pass the saved minimum, which does not establish a proven increase in energy expenditure.
Study evidence
Biotin Supportive 5 studies
Magnesium Supportive 61 studies
Niacin Supportive 17 studies
Thiamin Supportive 11 studies
Vitamin B6 Supportive 16 studies

Ingredients

IngredientAmount per servingScore
Thiamine (Thiamine Mononitrate)
50 mg 76
Riboflavin (Riboflavin 5-Phosphate)
55 mg 88
Niacin (Niacinamide)
50 mg 73
Vitamin B6 (Pyridoxal 5-Phosphate, Pyridoxine Hydrochloride)
55 mg 75
Folate
666 mcg DFE
Vitamin B12 (Cyanocobalamin)
50 mcg
Biotin (D-Biotin)
50 mcg
Pantothenic Acid (Calcium D-Pantothenate, Pantethine, Vitamin B5)
55 mg 70
Choline (Choline Bitartrate)
21 mg 50
Magnesium (Magnesium Citrate, Magnesium Oxide)
24 mg
Soy Lecithin
50 mg
Inositol
50 mg
Gluten Free Adults 18–50 Vegan Dairy Free Sugar Free Vegetarian
Report overview
A+ Ingredient Form & Label QualityF Dose, Safety & Label TransparencyA+ Value
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
A- Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyC Value
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: A randomized controlled trial.
    Hausenblas HA; Lynch T; Hooper S; Shrestha A; Rosendale D; Gu J · Sleep medicine: X · 2025
    Randomized trial80 participantsEnergy forMagnesium
  2. Total magnesium intake and risk of frailty in older women.
    Struijk EA; Fung TT; Bischoff-Ferrari HA; Willett WC; Lopez-Garcia E · Journal of cachexia, sarcopenia and muscle · 2024
    Cohort study81,524 participantsEnergy forMagnesium
  3. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  4. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  5. Physicochemical properties of and volatile compounds in riboflavin fortified cloudy apple juice; study of its effect on job fatigue among Egyptian construction workers.
    Fouad S; Ibrahim GE; Hussein AMS; Ibrahim FA; El Gendy A · Heliyon · 2021
    Non-randomized trialEnergy forRiboflavin
  6. Vitamin B status in patients with chronic fatigue syndrome.
    Heap LC; Peters TJ; Wessely S · Journal of the Royal Society of Medicine · 1999
    Case-control study30 participantsEnergy forRiboflavin
  7. B-vitamins, related vitamers, and metabolites in patients with quiescent inflammatory bowel disease and chronic fatigue treated with high dose oral thiamine.
    Bager P; Hvas CL; Hansen MM; Ueland P; Dahlerup JF · Molecular medicine (Cambridge, Mass.) · 2023
    Observational studyEnergy forRiboflavin
  8. Metabolic features of chronic fatigue syndrome.
    Naviaux RK; Naviaux JC; Li K; Bright AT; Alaynick WA; Wang L; Baxter A; Nathan N; Anderson W; Gordon E · Proceedings of the National Academy of Sciences of the United States of America · 2024
    Case-control study84 participantsEnergy forRiboflavin
  9. Effectiveness of Riboflavin in Inherited Metabolic Diseases: A Systematic Review
    Bregje Jaeger, Nina N Stolwijk, Femke Aaldering, Charlotte A Ruys, Marije Smits, Nicole I Wolf, Carla E M Hollak, Annet M Bosch · Journal of Inherited Metabolic Disease · 2026
    Systematic review381 studies pooledEnergy Metabolism Support forRiboflavin
  10. Influence of thiamin supplementation on the health and general well-being of an elderly Irish population with marginal thiamin deficiency.
    Smidt LJ; Cremin FM; Grivetti LE; Clifford AJ · Journal of gerontology · 1991
    Randomized trial80 participantsEnergy forThiamin
  11. Randomised clinical trial: high-dose oral thiamine versus placebo for chronic fatigue in patients with quiescent inflammatory bowel disease.
    Bager P; Hvas CL; Rud CL; Dahlerup JF · Alimentary pharmacology & therapeutics · 2021
    Randomized trial40 participantsEnergy forThiamin
  12. Dietary reference values for thiamin.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Turck D; Bresson JL; Burlingame B; Dean T; Fairweather-Tait S; Heinonen M; Hirsch-Ernst KI; Mangelsdorf I; McArdle HJ; Naska A; Nowicka G; Pentieva K; Sanz Y; Siani A; Sjödin A; Stern M; Tomé D; Van Loveren H; Vinceti M; Willatts P; Lamberg-Allardt C; Przyrembel H; Tetens I; Gudelj Rakic J; Ioannidou S; de Sesmaisons-Lecarré A; Forss AC; Neuhäuser-Berthold M · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusEnergy forThiamin
  13. Effects of thiamine supplementation on exercise-induced fatigue.
    Suzuki M; Itokawa Y · Metabolic brain disease · 1996
    Randomized trial16 participantsEnergy forThiamin
  14. Long-term maintenance treatment with 300 mg thiamine for fatigue in patients with inflammatory bowel disease: results from an open-label extension of the TARIF study.
    Bager P; Hvas CL; Rud CL; Dahlerup JF · Scandinavian journal of gastroenterology · 2022
    Randomized trialEnergy forThiamin
  15. A new perspective on vitamin B12 deficiency in rheumatology: a case-based review.
    Dułak NA; Rytlewska M; Jaskólska M; Chmielewski M · Rheumatology international · 2024
    Case series3 participantsEnergy forVitamin B12
  16. Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review, Meta-Analysis, and Meta-Regression.
    Markun S; Gravestock I; Jäger L; Rosemann T; Pichierri G; Burgstaller JM · Nutrients · 2021
    Meta-analysis6,276 participants16 studies pooledEnergy forVitamin B12
  17. Patients' experiences with methylcobalamin injections in amyotrophic lateral sclerosis.
    Zubair AS; Saab L; Scharer K; Khokhar B · Brain circulation · 2024
    Qualitative study5 participantsEnergy forVitamin B12
  18. Cobalamin deficiency: clinical picture and radiological findings.
    Briani C; Dalla Torre C; Citton V; Manara R; Pompanin S; Binotto G; Adami F · Nutrients · 2014
    Narrative reviewEnergy forVitamin B12
  19. Vitamin B12 Deficiency: Common Questions and Answers.
    Patel H; McGuirk R · American family physician · 2025
    Narrative reviewEnergy forVitamin B12
  20. Biotin and contribution to normal energy-yielding metabolism: evaluation of a health claim pursuant to Article 14 of Regulation (EC) No 1924/2006.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusMetabolism Support forBiotin