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B-Complex

Natures Plus Source of Life Garden
4.7
★ ★ ★ ★ ★
(3122 ratings)
Biotin 300 mcg
Folate 400 mcg
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Score57
The broad B-complex includes methylcobalamin and useful biotin, but repeated source entries and a hidden blend cloud the actual formula. High cost and uncertain folate form limit its appeal.
How scoring works
Quantity:60 Capsule(s) • (30 servings)
Goals:
General Health
Hair Health

Score 57

The broad B-complex includes methylcobalamin and useful biotin, but repeated source entries and a hidden blend cloud the actual formula. High cost and uncertain folate form limit its appeal.
How scoring works
$22.61($0.75 per serving)
iHerb
$ 22.61
Pure Formulas
$ 22.61
Vitacost
$ 24.89
Amazon
$ 22.61
iHerb
$ 22.61
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Analysis

The formula aims to derive several B vitamins from guava, holy basil, and lemon extracts, while methylcobalamin and biotin are clearly named. The repeated nutrient entries can look additive even when they may describe the same stated total across multiple sources, so the physical label needs careful reading.

Folate reaches a useful amount but is listed as folic acid without an active chemical-form confirmation. Biotin at 300 mcg supports basic intake rather than a high-dose hair-and-nail strategy, and the 300 mg whole-food blend lacks component amounts.

Two capsules supply broad coverage but carry a high serving cost. It fits users who value botanical sourcing, while those prioritizing precise doses and active folate may prefer a cleaner B-complex label.

Who is it for
  • Adults who value botanically sourced B vitamins
  • Users seeking methylcobalamin and moderate biotin
  • People willing to verify repeated label entries
Best for
  • Broad B-vitamin coverage
  • Methylcobalamin intake
  • Moderate biotin supplementation

Pros

  • Uses methylcobalamin
  • Provides 300 mcg of biotin
  • Includes a broad range of B vitamins
  • Names the botanical nutrient sources

Cons

  • Repeated entries make nutrient totals ambiguous
  • Folate is not identified as an active form
  • The whole-food blend lacks individual amounts
  • Requires two capsules at a high serving cost

Warnings

  • Biotin can interfere with some laboratory tests, including thyroid and cardiac-marker assays, so disclose use before testing
  • High folate exposure should be paired with adequate B12 despite the included methylcobalamin
  • Holy basil may affect blood glucose or interact with anticoagulant and antiplatelet medicines in sensitive users

Nutrient quality

68 High impact

Broad B-vitamin coverage fits general nutrition and deficiency-related hair support. Repeated source listings and an opaque whole-food blend create substantial padding.

Ingredient transparency

45 Lower impact

Capsule and serving counts indicate a two-capsule serving. The whole-food blend hides all component-level doses.

Customer satisfaction

70 High impact

Feedback volume is substantial enough to stabilize the aggregate signal. No complaint text is supplied, so repeated negative themes cannot be assessed.

Value for money

46 Lower impact

Broad vitamin coverage offers some value, but confusing labeling weakens price justification. An opaque whole-food blend and repeated source lines add limited assessable value.

Report analysis

Goals

General Health
Impact
High effect
B+ Goal FitC Strength of SupportC+ CoverageC- Formula Quality
Folate · 400 mcgVitamin B12 · 100 mcg

Broad B-vitamin coverage may support energy metabolism, and methylcobalamin is a useful active B12 form. The unusual source presentation makes the formula harder to interpret than a standard B-complex.

Guava, holy basil, and lemon are repeatedly listed as vitamin forms, while a separate whole-food blend is not detailed. Effective nutrient totals and the contribution of the botanical sources therefore remain uncertain.

Study evidence
Folate Supportive 80 studies
Hair Health
Impact
Moderate effect
D Goal FitB- Strength of SupportD CoverageD Formula Quality
Biotin · 300 mcg

Folate, B12, biotin, and other B vitamins may support normal follicle cell turnover when intake is inadequate. They do not directly provide keratin building blocks or target common hormonal causes of thinning.

The formula supplies meaningful vitamin amounts, but repeated botanical-source labeling and a broad whole-food blend make the design harder to assess. Benefits for hair are likely to depend on correcting a deficiency rather than the size of the ingredient list.

Study evidence
Biotin Supportive 4 studies
Folate Mixed 15 studies

Ingredients

IngredientAmount per serving
Thiamine (Guava Extract, Holy Basil Extract, Lemon Extract)
5 mg
Riboflavin (Guava Extract, Holy Basil Extract, Lemon Extract)
4.5 mg
Niacin (Guava Extract, Holy Basil Extract, Lemon Extract)
10 mg
Vitamin B6 (Guava Extract, Holy Basil Extract, Lemon Extract)
5 mg
Folic Acid (Guava Extract, Holy Basil Extract, Lemon Extract)
400 mcg
Vitamin B12 (Methylcobalamin)
100 mcg
Biotin
300 mcg
Pantothenic Acid (Guava Extract, Holy Basil Extract, Lemon Extract)
9 mg
Certified Organic Whole Food Blend
300 mg
Gluten Free Adults 18–50 Vegan Dairy Free Organic Vegetarian
Report overview
Biotin · 300 mcg OverallScore59
B+ Active Ingredient Quality & BioavailabilityF Dose, Safety & Label TransparencyC Value

A clearly disclosed 300 mcg biotin amount supports basic nutrition, but the label does not verify the biologically active isomer. The amount is well below the range used for targeted hair and nail support. Value is best judged across the full multinutrient formula rather than from biotin alone.

F Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyD- Value

The B-complex supplies 400 mcg of folate from guava, holy basil, and lemon extracts with ample methylcobalamin. Food-based sourcing reaches the preferred dose but does not identify an active chemical form or validated isomer. Cost efficiency is limited compared with clearly active methylfolate products.

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Sources

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

  1. The Role of Sesbania grandiflora-Derived Biotin and Bambusa arundinacea-Derived Silica Extracts in Promoting Hair, Skin, and Nail Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study.
    Patel MN; Maheshvari J; Patel N · Cureus · 2025
    Randomized trial105 participantsHair Health forBiotin
  2. Low serum biotinidase activity in children with valproic acid monotherapy.
    Schulpis KH; Karikas GA; Tjamouranis J; Regoutas S; Tsakiris S · Epilepsia · 2001
    Clinical trial125 participantsHair Health forBiotin
  3. The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity.
    Soleymani T; Lo Sicco K; Shapiro J · Journal of drugs in dermatology : JDD · 2018
    Narrative reviewHair Health forBiotin
  4. Vitamins A, B, C, and D: A Short Review for the Dermatologist.
    Coerdt KM; Goggins CA; Khachemoune A · Alternative therapies in health and medicine · 2021
    Narrative reviewHair Health forBiotin
  5. Intakes of Folate, Vitamin B6, and Vitamin B12 in Relation to All-Cause and Cause-Specific Mortality: A National Population-Based Cohort.
    Bo Y; Xu H; Zhang H; Zhang J; Wan Z; Zhao X; Yu Z · Nutrients · 2022
    Cohort study55,569 participantsGeneral Health forFolate
  6. The responsiveness of plasma homocysteine to small increases in dietary folic acid: a primary care study.
    Schorah CJ; Devitt H; Lucock M; Dowell AC · European journal of clinical nutrition · 1998
    Randomized trial119 participantsGeneral Health forFolate
  7. Associations of Serum Folate and Homocysteine Concentrations with All-Cause, Cardiovascular Disease, and Cancer Mortality in Men and Women in Korea: the Cardiovascular Disease Association Study.
    Song S; Song BM; Park HY · The Journal of nutrition · 2023
    Cohort study21,260 participantsGeneral Health forFolate
  8. The concept of folic acid supplementation and its role in prevention of neural tube defect among pregnant women: PRISMA.
    Seyoum Tola F · Medicine · 2024
    Systematic reviewGeneral Health forFolate
  9. Systematic review of adverse health outcomes associated with high serum or red blood cell folate concentrations.
    Colapinto CK; O'Connor DL; Sampson M; Williams B; Tremblay MS · Journal of public health (Oxford, England) · 2017
    Systematic review71,847 participants46 studies pooledGeneral Health forFolate
  10. Hair Loss After Metabolic and Bariatric Surgery: a Systematic Review and Meta-analysis.
    Zhang W; Fan M; Wang C; Mahawar K; Parmar C; Chen W; Yang W; Global Bariatric Research Collaborative · Obesity surgery · 2021
    Meta-analysis2,538 participants18 studies pooledHair Health forFolate
  11. Quantitative Analysis of Selected Circulating Hematological Biomarkers, Essential Minerals, Vitamins, and Thyroid Hormones in Females Affected by Hair Loss.
    Al-Fawaeir S; Al-Odat I · Diseases (Basel, Switzerland) · 2025
    Case-control study200 participantsHair Health forFolate
  12. Twelve weeks of protracted venous infusion of fluorouracil (5-FU) is as effective as 6 months of bolus 5-FU and folinic acid as adjuvant treatment in colorectal cancer.
    Saini A; Norman AR; Cunningham D; Chau I; Hill M; Tait D; Hickish T; Iveson T; Lofts F; Jodrell D; Ross PJ; Oates J · British journal of cancer · 2003
    Randomized trialHair Health forFolate
  13. Role of oxaliplatin combined with 5-fluorouracil and folinic acid in the first- and second-line treatment of advanced colorectal cancer.
    Jonker D; Rumble RB; Maroun J; Gastrointestinal Cancer Disease Site Groupof Cancer Care Ontario’s Program in Evidence-Based Care · Current oncology (Toronto, Ont.) · 2012
    Randomized trialHair Health forFolate
  14. Phase I-II study of vinorelbine in combination with 5-fluorouracil and folinic acid as first-line chemotherapy in metastatic breast cancer: a regimen with a low subjective toxic burden.
    Nolè F; de Braud F; Aapro M; Minchella I; De Pas TM; Zampino MG; Monti S; Andreoni G; Goldhirsch A · Annals of oncology : official journal of the European Society for Medical Oncology · 1997
    Randomized trialHair Health forFolate