NOW Supplements Methyl B-12 (Methylcobalamin) 5,000 mcg - 120 Lozenges Review
#6 of 9 · Best High-Dose Sublingual✓ Label verified · Supplement Facts read Sep 7, 2026Real retailer photo, cut out. Label unedited.
Consider it. Great execution of a high-dose sublingual you probably don't need. An A-rated, UL-audited in-house testing program and a strong per-serving cost for a 5,000 mcg sublingual.
~$18~$0.15
Why It Scores 8.0 — And The Label Line Behind Each Number
Form & Bioavailability
20% of scoreActive methylcobalamin in a sublingual lozenge. The methyl form is fine; the sublingual angle is the weak part — evidence that it out-absorbs a swallowed dose is thin.
- Form
- Methylcobalamin (sublingual lozenge)
- Delivery
- Chew or dissolve in mouth
Dose vs Clinical Range
20% of score5,000 mcg is a megadose far above the oral repletion range. Absorption is saturable, so the body uses only a small fraction and excretes the rest — the main reason this pick sits lower.
- Dose
- 5,000 mcg per lozenge
Third-Party Testing & Purity
25% of scoreNOW runs an in-house, UL-audited GMP and testing program that consumer watchdogs rate highly (A-rated). It's a strong operation, though it's not an independent USP or NSF product seal.
- Testing
- UL-audited GMP; A-rated by watchdogs (no USP/NSF seal)
Value Per Serving
15% of scoreAt ~$0.15/serving it's strong value for a 5,000 mcg sublingual, single-active formula — you get a lot of B12 per dollar, even if you don't need it all.
- Count
- 120 lozenges / 120 servings
- Cost per serving
- ~$0.15
GI Tolerance & Format Suitability
20% of scoreA chew-or-dissolve lozenge that's easy for pill-averse users and generally well tolerated, with no swallowing required.
Label verified. Every figure read from the Supplement Facts photo, Sep 7, 2026.
Marketing Claims Vs. Reality
A 5,000 mcg megadose is more effective
Passive diffusion absorbs only about 1% of an oral dose, so a larger dose does raise the absolute amount absorbed — but 1,000 mcg already corrects deficiency and the excess is excreted (Stabler 2013).
Sublingual absorbs better than swallowing
Head-to-head evidence that sublingual outperforms swallowed B12 is thin; oral repletion doses already normalize status (Wang Cochrane 2018).
In-house, UL-audited GMP and testing
NOW's testing program is UL-audited and rated highly (A-rated) by consumer watchdogs, though it's not an independent USP or NSF product seal.
Boosts energy in healthy adults
B12 only relieves fatigue when it corrects a real deficiency; a megadose in replete people does not add energy (Tardy 2020).
What Our Test Actually Found
The brand is the strength
NOW's in-house, UL-audited testing is genuinely reassuring and watchdog-rated. If you want a high-dose sublingual, this is the best-run one.
The dose is the weakness
5,000 mcg is far more than your body can use. Most of it is excreted, so the megadose is a marketing number, not a repletion advantage.
Sublingual is a thin promise
The 'dissolves under the tongue so it absorbs better' pitch isn't well supported. It's a fine format, not a superior one.
Strong value for what it is
At about fifteen cents a lozenge, it's good value in the sublingual category — just remember you're paying for B12 you'll mostly excrete.
Full analysis: all pros & cons (7), buy if / skip if
- A-rated, UL-audited in-house GMP and testing program
- Strong cost per serving for a 5,000 mcg sublingual
- 120-count, single-active formula
- Reputable, watchdog-favored brand
- 5,000 mcg is a megadose — most of it is simply excreted, not used
- The 'sublingual absorbs better than swallowing' claim is weakly supported
- No USP or NSF seal
- You specifically want a high-dose sublingual lozenge
- You value NOW's in-house, UL-audited testing program
- You want a strong per-serving cost in the sublingual format
- You want a sensible repletion dose rather than a megadose
- You believe sublingual delivery is meaningfully better (it isn't well supported)
An A-rated, UL-audited in-house testing program and a strong per-serving cost for a 5,000 mcg sublingual. But the dose vastly exceeds what your body can use, so most is excreted, and the 'sublingual absorbs better' claim is weakly supported. Buy it if you specifically want this format — not because the megadose does more.
If you specifically want a high-dose sublingual, NOW's A-rated 5,000 mcg lozenge is the best-executed version of that idea. NOW earns trust with an in-house, UL-audited GMP and testing program that consumer watchdogs rate highly, and the per-serving cost is strong for a 5,000 mcg lozenge. The catch is the concept itself: 5,000 mcg vastly exceeds what your body can use, so most of it is excreted, and the 'sublingual beats swallowing' claim is thin.
Best execution of a concept you may not need
NOW earns trust with an in-house, UL-audited GMP program that consumer watchdogs rate highly, and the per-serving cost is strong for a 5,000 mcg sublingual. But the dose is the catch: 5,000 mcg vastly exceeds what your body can use, so most of it is excreted, and the 'sublingual beats swallowing' claim is thin. It's a great execution of a concept you probably don't need.
If This Doesn’t Fit — Try These
07Jarrow Methyl B-12 Cherry
A popular, wallet-friendly sublingual that does the job for suspected deficiency.
01Thorne Vitamin B12
If you want a no-drama, trust-first B12, this is it.
05Garden of Life B12 Spray
The best option for pill-averse or older users, with the strongest clean-label stack in the field — USDA Organic plus Non-GMO Project Verified plus vegan.
Quick Answers
Do I need 5,000 mcg?
Almost certainly not. Your body can only use a small fraction; the rest is excreted. A 1,000 mcg dose already corrects a deficiency.
Is a sublingual lozenge better than a pill?
The evidence doesn't clearly support that. The real benefit is that you don't have to swallow it, not superior absorption.
Is NOW a trustworthy brand?
Yes. Its in-house testing is UL-audited and rated highly by consumer watchdogs, even though it isn't an independent USP or NSF product seal.
Will it boost my energy?
Only if you're deficient. A megadose won't add energy for someone whose B12 is already normal.
Sources & Further Reading
3 peer-reviewed sources, each linked to PubMed
- [1] Stabler SP. Vitamin B12 Deficiency. N Engl J Med. 2013;368(2):149-160. PMID 23301732 — Vitamin B12 Deficiency. Oral cobalamin absorption is saturable; around 1,000 mcg corrects deficiency and larger doses offer little added repletion benefit.
- [2] Wang H, et al. Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency. Cochrane Database Syst Rev. 2018;3:CD004655. PMID 29543316 — Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency. Standard oral repletion normalizes B12; no clear superiority is demonstrated for sublingual over swallowed delivery.
- [3] Tardy AL, et al. Vitamins and Minerals for Energy, Fatigue and Cognition. Nutrients. 2020;12(1):228. PMID 31963141 — Vitamins and Minerals for Energy, Fatigue and Cognition: A Narrative Review of the Biochemical and Clinical Evidence. Correcting a B12 deficiency reduces fatigue, but a megadose in already-replete people does not increase energy.
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