NaturalSlim Liquid B12 Vitamins with Vitamin D
- Vitamin B12
- Liquid
- Vitamin B12 Supplement
- 1 fl oz
- Better rated than 87%
A flavored sublingual B12 and vitamin D combination for buyers who prefer liquid drops over capsules.
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How it ranks among the 130 vitamin b12 we track
4.8★ across 1,300 Amazon ratings, Bayesian-smoothed toward the category average.
1,300 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
700+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 130 vitamin b12 we track - how the scorecard works · full vitamin b12 data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
NaturalSlim's Metab-12 is a berry-flavored, sublingual liquid B12 formula combined with vitamin D, sold in a 1 fl oz bottle and marketed for metabolism and energy support.
Methylcobalamin is the specific form of B12 used here, taken sublingually so the drops sit under the tongue rather than being swallowed like a capsule. Pairing B12 with vitamin D in one liquid keeps both nutrients in a single daily dose instead of two separate products. Berry flavor sets this apart from unflavored B12 liquids on the market.
- 2500mcg methylcobalamin B12 per serving
- Includes vitamin D in the same formula
- Sublingual liquid drop format
- Berry flavor, gluten-free
Who it's for
Fits people who want a flavored, sublingual B12 and vitamin D combination rather than a capsule or unflavored drop. It is not the choice for anyone who wants B12 alone without added vitamin D, or who prefers capsules over liquid drops.
Strengths and trade-offs
Drawn from this product's published specifications.
- Combines B12 and vitamin D in one liquid
- Sublingual dropper format
- Berry flavor, not unflavored
- Does not offer a B12-only option without added vitamin D
- 1 fl oz bottle is a smaller volume than some liquid B12 products
Performance notes
The sublingual method places the drops under the tongue rather than swallowing them, which is the intended way B12 liquids like this are typically used. Methylcobalamin is the specific B12 form in the formula, delivered at 2500mcg per serving alongside vitamin D in the same drops. The berry flavor is added, unlike unflavored liquid B12 products.
Specifications
| Brand | NaturalSlim |
|---|---|
| Model | Metab12 |
| Form | Liquid |
| Supplement Type | Vitamin B12 Supplement |
| Count | 1 fl oz |
| Flavor | Berry |
| Benefits | Metabolism Improvement |
| Diet | Gluten Free |
| Allergens | Gluten Free |
How it compares
This product against the closest alternatives we track in vitamin b12.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| NaturalSlim Liquid B12 Vitamins with Vitamin DThis product | 4.8 / 5 | 1,300 | 4.4 / 5 |
| Nature's Bounty Vitamin B12 2500 mcgNature’s | 4.8 / 5 | 26,800 | 4.7 / 5 |
| Nature Made Vitamin B12 1000 mcgNATURE | 4.8 / 5 | 21,400 | 4.7 / 5 |
| Solgar Vitamin B12 1000 mcgSolgar | 4.8 / 5 | 11,500 | 4.7 / 5 |
| Natrol Vitamin B12 5000 mcg Fast Dissolve B12 SupplementNatrol | 4.7 / 5 | 40,300 | 4.6 / 5 |
Similar vitamin b12 from other brands
Questions about the NaturalSlim Metab12
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What form of B12 does NaturalSlim's Metab-12 use?
It uses methylcobalamin at 2500mcg per serving.
Does this product include vitamin D as well?
Yes, vitamin D is combined with the B12 in the same liquid formula.
How is this B12 meant to be taken?
It is a sublingual liquid, meant to be taken as drops under the tongue rather than swallowed like a capsule.