SPECIMEN #KIRKLAND
Verified
B_VITAMINSKirkland Signature
Vitamin B12 5000mcg Sublingual
300 sublingual methylcobalamin tablets at Costco pricing. Active B12 form, sublingual delivery, nearly a year supply. If you're vegan, over 50, or on metformin, this is the B12 to grab on your Costco run.
8.0/10
EXCELLENT300 sublingual methylcobalamin tablets at Costco pricing. Uses the active form (not cyanocobalamin). Sublingual bypasses gut absorption. Nearly a year supply. One of Costco's best supplement values.
1 ingredientTablets300 servings
We'd recommend thisEvidence
8.0
Dosing
8.0
SynergyN/A (single ingredient)
Whenmorning
Foodwithout food
SafetyAll clear
ResearchStrong evidence
What We Like
- Methylcobalamin (active form, no conversion needed).
- Sublingual bypasses gut absorption barriers.
- 300 tablets (nearly 1 year supply).
- Costco bulk pricing.
Watch Out For
- 5000mcg is correction dose (1000mcg sufficient for maintenance).
- Single ingredient.
What We Analyzed
Verified Supplement Facts
Every dose checked against clinical research
We analyzed the actual supplement facts panel for this product. Every ingredient dose below was cross-referenced with published clinical trials to determine if it matches what studies actually use.
1 ingredients analyzed
Source: Official product page
Ingredient Breakdown
Clinical Adequate Underdosed Overdosed|Bar = % of clinical dose
IngredientDoseStatusvs. Clinical
In our database (click to learn more) Not yet reviewed
Our Analysis
Best For
Vegans, vegetarians, adults 50+, metformin users.
Skip This If
People not B12 deficient (1000mcg version suffices).
Time to Feel
1-2 weeks if deficient.
Value
EXCELLENT
How to take: Daily.
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