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Description
PL B-12 Intrinsic Factor Progressive LaboratoriesFactors for Support of B 12 Bioavailability Vitamin B12 is a water soluble vitamin needed for normal nerve cell activity, DNA replication, and production of the mood affecting substance SAMe (S adenosyl Lmethionine). Vitamin B12 acts with folic acid and vitamin B6 to control homocysteine levels. Absorption of vitamin B12 is reduced with increasing age. Some research suggests that elderly people may benefit from 10 to 25 mcg per day of vitamin B12. One
Factors for Support of B-12 Bioavailability
Vitamin B12 is a water-soluble vitamin needed for normal nerve cell activity, DNA replication, and production of the mood-affecting substance SAMe (S-adenosyl-Lmethionine). Vitamin B12 acts with folic acid and vitamin B6 to control homocysteine levels.
Absorption of vitamin B12 is reduced with increasing age. Some research suggests that elderly people may benefit from 10 to 25 mcg per day of vitamin B12. One study of elderly people with vitamin B12 deficiency suggested that as much as 500 to 1,000 mcg of vitamin B12 per day might be necessary to achieve optimal vitamin B12 status. Vitamin B12 status was measured in this study using a sensitive laboratory test (the plasma methylmalonic acid concentration).
Supplementation with B-12 Intrinsic Factor:
• Supports nervous system health
• Supports red blood cell production
• Supports energy
• Supports metabolism of fats and carbohydrates
Absorption of vitamin B12 is reduced with increasing age. Some research suggests that elderly people may benefit from 10 to 25 mcg per day of vitamin B12. One study of elderly people with vitamin B12 deficiency suggested that as much as 500 to 1,000 mcg of vitamin B12 per day might be necessary to achieve optimal vitamin B12 status. Vitamin B12 status was measured in this study using a sensitive laboratory test (the plasma methylmalonic acid concentration).
Supplementation with B-12 Intrinsic Factor:
• Supports nervous system health
• Supports red blood cell production
• Supports energy
• Supports metabolism of fats and carbohydrates
Other Ingredients :
gelatin (capsule), rice flour, silica, maltodextrin.
Recommendations :
Take one capsule daily, or more, as directed by your healthcare practitioner.
If you are pregnant, nursing, or taking medication, consult your healthcare practitioner before use. Keep out of reach of children.
Servings:
60
| Ingredient | Amount | Daily Value |
|---|---|---|
| Folate [(6S)-5-methyltetrahydrofolic acid, glucosamine salt] Quatrefolic® | 800 mcg | 200% |
| Vitamin B-12 (as methylcobalamin) | 500 mcg | 8,333% |
| Biotin | 300 mcg | 100% |
| Intrinsic Factor | 20 mg | * |
| * Percent Daily Values (%DV) are based on a 2,000 calorie diet. | ||
| ** Daily Value (DV) not established. |
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.6 ★★★★★
Based on 30 reviews
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Product Reviews
★★★★★ 5
Buen zapato
Size: 10 Toddler, Color: Shiny Elements - Glitter Clear
Siempre compro esta marca porque es una buena compra, son zapatos cómodos para las niñas, muy prácticos para ponerlos y de excelente calidad.
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Reviewed in the United States on February 28, 2026
★★★★★ 5
Beyond my expectations
Size: 10 Wide, Color: Mocha Grainy Leather
Really nice shoes. Wide enough and comfortable I’m keeping these.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Good Fit Out of the Box
Size: 9, Color: Black
The shoes came with the correct size and is a good fit. They were originally pretty stiff, but are much better now after breaking them in. They look good. but as other's have said, they are made of synthetic leather and in my opinion have kind of a plastic look to them. The quality is good with ridged rubbber soles. I thought they were kind of expensive, but then again I haven't purchased these type of shoes in a while. A family member told me that if they were real leather, they would have been a lot more expensive. For what the shoes are I would recommend the purchase.
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Reviewed in the United States on February 11, 2025
★★★★★ 3
I wanted to love these
Size: 9, Color: Black Leather
These are very good looking in person, especially the buckles and the pop of red on black.
Alas, I have another pair of Marc Joseph shoes to compare comfort and fit, and this pair simply hurts my feet.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Great shoes
Size: 12, Color: Black
These are great. We buy them again and again
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Reviewed in the United States on May 4, 2026