Methylcobalamin B12

HighUnderdosed

What the lab found

Contained only 49% of claimed B12.

Failure type · Underdosed

Active ingredient measured significantly below the labeled amount — not therapeutic.

Source

NOW Foods independent testing, 2025

Safer alternative

Nature Made B12 1,000 mcg

Is your supplement on this list?

Instant safety check against 373 failed products plus 177 drug interactions.

More products that failed

Nature Made

Super B

Overdosed · High

New Chapter

Fermented Coenzyme B Complex

Underdosed · Moderate

Swanson

P-5-P (Pyridoxal 5 Phosphate)

Underdosed · Moderate

Pure Encapsulations

B12 Liquid

Mislabeled · High

Lab data sourced from independent third-party testing reports. Educational only — Avelor does not provide medical advice.

Failed Products

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B Vitamins · Raw Science

Methylcobalamin B12

HighUnderdosed

What the lab found

Contained only 49% of claimed B12.

Failure type · Underdosed

Active ingredient measured significantly below the labeled amount — not therapeutic.

Source

NOW Foods independent testing, 2025

Safer alternative

Nature Made B12 1,000 mcg

Is your supplement on this list?

Instant safety check against 373 failed products plus 177 drug interactions.

More products that failed

Nature Made

Super B

Overdosed · High

New Chapter

Fermented Coenzyme B Complex

Underdosed · Moderate

Swanson

P-5-P (Pyridoxal 5 Phosphate)

Underdosed · Moderate

Pure Encapsulations

B12 Liquid

Mislabeled · High

Lab data sourced from independent third-party testing reports. Educational only — Avelor does not provide medical advice.