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Liquid B12 2000µg with B-Complex 59ml vs Fully Active B Complex, 60 Veg Caps

Side-by-side comparison of scores, ingredients, prices and real customer feedback for Liquid B12 2000µg with B-Complex 59ml and Fully Active B Complex, 60 Veg Caps.

Last verified: 07 Apr 2026 · Based on 53 reviews

80.0
Quick Answer

Liquid B12 2000µg with B-Complex 59ml scores 80.0/100 vs Fully Active B Complex, 60 Veg Caps at 79.0/100. Liquid B12 2000µg with B-Complex 59ml wins on effectiveness, side effects, certifications. Fully Active B Complex, 60 Veg Caps is stronger on ingredient quality and value for money.

Which is better: Liquid B12 2000µg with B-Co... or Fully Active B Complex, 60 Veg Caps?

Doctor's Best edges ahead for those who need precise active forms — its Quatrefolic® folate and methylcobalamin make it the better pick for MTHFR variants despite identical scores. Solgar's liquid format wins for anyone with absorption difficulties or who struggles with capsules, and its 5-star satisfaction rate speaks for itself.

— AIScored Editorial Team

How Do the Scores Compare?

Liquid B12 2000µg with B-Co...
Fully Active B Complex, 60 Veg Caps
Liquid B12 2000µg with B-Complex 59ml
Liquid B12 2000µg with B-Co...
Solgar
Fully Active B Complex, 60 Veg Caps
Fully Active B Complex, 60 Veg Caps
Doctor's Best
Overall Score 80.0 79.0
Effectiveness 90.0/100
Best
82.0/100
Ingredient Quality 70.0/100 85.0/100
Best
Value for Money 80.0/100 83.0/100
Best
Side Effects 80.0/100
Best
76.0/100
Certifications 40.0/100
Best
37.0/100
Best Price £15.60 Holland & Barrett →
Cheapest
£16.07 iHerb →
Form liquid None
Dose None None
Third-Party Tested ✗ No ✗ No
Reviews Analysed 4 49

Liquid B12 2000µg with B-Complex 59ml

Pros

  • Consistently excellent user satisfaction (4/4 reviews at 5 stars) with reported improvement in energy and B12 levels
  • High bioavailability sublingual format may absorb better than tablets for B12 absorption
  • Generous 2000µg B12 dose plus complete B-complex for synergistic metabolic support
  • Suitable for vegans and vegetarians (particularly important given B12 is animal-derived)

Cons

  • No third-party testing or quality verification certification visible
  • Contains palm kernel oil (glycerin source) which may concern environmentally-conscious consumers
  • Cyanocobalamin form is synthetic; some prefer methylcobalamin as more bioavailable
  • Potassium sorbate preservative and artificial flavoring agents may deter some natural-focused buyers

Best For

Vegans and vegetarians (critical B12 source) People with B12 deficiency or absorption issues Those who struggle to swallow tablets or capsules Individuals seeking high-potency B12 with metabolic support People experiencing fatigue or low energy
View full review →

Fully Active B Complex, 60 Veg Caps

Pros

  • Active B vitamin forms throughout — Quatrefolic® folate, methylcobalamin B12, riboflavin 5'-phosphate — not cheaper synthetic alternatives
  • Reviewers consistently report reduced fatigue and better energy, often noticing effects within a few days
  • 1000mcg methylcobalamin per capsule is a solid B12 dose at a price most reviewers call good value for a 2-month supply
  • Niacin delivered as niacinamide — no flush reported, and capsule size described as easy to swallow with no aftertaste

Cons

  • Bright yellow urine and occasional smell from sweat noted by several users — harmless but worth knowing before starting
  • Some users report burping or mild digestive discomfort after taking, particularly on an empty stomach
  • No third-party testing — the active form claims rely on brand transparency, not independent verification
  • One reviewer questions whether all forms are truly active, suggesting some inactive B vitamin forms may be included alongside the premium ones

Best For

People with MTHFR gene variants who cannot convert folic acid and need pre-formed 5-MTHF Those with diagnosed or suspected B12 deficiency, including diabetics on metformin who deplete B12 Anyone seeking a budget-friendly active-form B complex without paying supplement premium brand prices Gym-goers wanting pre-workout energy support without stimulants or niacin flush
View full review →

What does the data say about Liquid B12 2000µg with... vs Fully Active B Complex...?

Both products score 80/100 overall, but they're built quite differently. Doctor's Best Fully Active B Complex (£16.07) uses genuinely bioavailable forms throughout — Quatrefolic® folate, methylcobalamin B12, and riboflavin 5'-phosphate — meaning your body can use them without conversion. Solgar's Liquid B12 (£15.60) takes a different approach: a sublingual liquid delivering 2000µg of B12 alongside a broader B-complex, where the format itself aids absorption directly into the bloodstream. Solgar scores higher on effectiveness (90 vs 82) but lower on ingredient quality (70 vs 88), reflecting its simpler formulation.

Doctor's Best suits people with MTHFR gene variants or confirmed deficiencies who need the active folate form specifically. It's also capsule-based, which works well for anyone who prefers a conventional pill. Solgar makes more sense for vegans and vegetarians who need serious B12 support, or anyone with absorption problems — sublingual delivery bypasses the gut entirely, which matters if your intrinsic factor is compromised.

Practically, expect bright yellow urine with Doctor's Best due to the riboflavin dose — harmless but worth knowing. Solgar's liquid format suits those who struggle swallowing capsules, though the palm kernel oil content may put off environmentally-conscious buyers. Neither product carries third-party testing certification.

Liquid B12 2000µg with B-Complex 59ml Winner 80.0/100

Solgar's Liquid B12 2000µg with B-Complex is a sublingual supplement designed for those who struggle with tablets or capsules, with all reviewers giving 5-star ratings and reporting improved energy levels and B12 status.

Effectiveness
Liquid B12 2000µ..
90.0/100
Fully Active B C..
82.0/100
Ingredient Quality
Liquid B12 2000µ..
70.0/100
Fully Active B C..
85.0/100
Value for Money
Liquid B12 2000µ..
80.0/100
Fully Active B C..
83.0/100
Side Effects
Liquid B12 2000µ..
80.0/100
Fully Active B C..
76.0/100
Certifications
Liquid B12 2000µ..
40.0/100
Fully Active B C..
37.0/100

What are the key differences?

Liquid B12 2000µg with .. is best for: Vegans and vegetarians (critical B12 source), People with B12 deficiency or absorption issues
Fully Active B Complex,.. is best for: People with MTHFR gene variants who cannot convert folic acid and need pre-formed 5-MTHF, Those with diagnosed or suspected B12 deficiency, including diabetics on metformin who deplete B12

Frequently Asked Questions

Which is better, Liquid B12 2000µg with B-Complex 59ml or Fully Active B Complex, 60 Veg Caps?
Liquid B12 2000µg with B-Complex 59ml scores 80.0/100 overall while Fully Active B Complex, 60 Veg Caps scores 79.0/100. Liquid B12 2000µg with B-Complex 59ml comes out ahead, scoring higher on effectiveness (90.0 vs 82.0). Liquid B12 2000µg with B-Compl is best suited for Vegans and vegetarians (critical B12 source) and People with B12 deficiency or absorption issues. Fully Active B Complex, 60 Veg Caps is better for People with MTHFR gene variants who cannot convert folic acid and need pre-formed 5-MTHF and Those with diagnosed or suspected B12 deficiency, including diabetics on metformin who deplete B12.
Is Liquid B12 2000µg with B-Complex 59ml worth the price compared to Fully Active B Complex, 60 Veg Caps?
Liquid B12 2000µg with B-Complex 59ml costs £15.60 while Fully Active B Complex, 60 Veg Caps is £16.07. For value, Liquid B12 2000µg with B-Complex 59ml scores 80.0/100 vs Fully Active B Complex, 60 Veg Caps's 83.0/100. Fully Active B Complex, 60 Veg Caps delivers better value relative to its quality.
Which has fewer side effects?
Liquid B12 2000µg with B-Complex 59ml scores 80.0/100 for side effects (higher means fewer reported issues) while Fully Active B Complex, 60 Veg Caps scores 76.0/100. Reviewers report fewer side effects with Liquid B12 2000µg with B-Complex 59ml. For certification and testing, Liquid B12 2000µg wi scores 40.0/100 vs Fully Active B Compl's 37.0/100. Always consult a healthcare professional before starting any supplement.

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Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.

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