🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 14% of ingredients have research evidence
B Label Compliance Grade

Product Label

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Label Data

1 Tablet(s) Serving Size
Other Combinations Product Type
14% Evidence Coverage

Supplement Facts — Evidence Check

Vitamin C
1 Gram(s) (1667% DV)
Calcium
120 mg (12% DV)
Transport C-Plus
1.3 Gram(s)
📊 Market median: 500.0mg (283 products) 📚 173 studies (Tier A: 0, B: 62)
This product: 75mg
Acerola powder
25 mg
Rose Hips powder
25 mg
25 mg
📊 Market median: 500.0mg (19 products)
This product: 25mg

Other Ingredients

Cellulose Croscarmellose Sodium Stearic Acid Magnesium Stearate Silica Vegetarian Coating

Label Claims — Verification

Nutrient
All Other
Structure/Function
All Other (99% of products) Structure/Function (83% of products) Nutrient (54% of products)

Target Groups

Vegan Vegetarian Adult (18 - 50 Years) Gluten Free Dairy Free

Product Information

📋 Directions for Use

SUGGESTED USAGE: Take 1 tablet daily, preferably with a meal, or as directed by your healthcare practitioner.

⚠️ Warnings & Precautions

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

CAUTIONS/INTERACTIONS: Vitamin C may interact with oral estrogen medications, HMG CoA inhibitors, and blood thinning medications.

Doses of >2000 mg Vitamin C per day may cause GI disturbances in sensitive individuals and may not be advisable for some people.

Consult your healthcare practitioner if you take any prescription medications or have a medical condition before exceeding the recommended dosage for this product.

Do Not Eat Freshness Packet. Keep in Bottle.

🧪 Formulation Notes

This extra strength product has twice the Vitamin C (1,000 mg per tablet) as in our regular strength product (500 mg per capsule).

Transport C-Plus

Vegetarian/Vegan

Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.

Non-GMO

HOW IT WORKS: ProtoSorb C is a unique formulation featuring Transport C-PLUS Threonic Acid, which has been shown to enhance uptake of Vitamin C.* This buffered, non-acidic Vitamin C supplement also contributes Alpha-Lipoic Acid, a free radical scavenger known to help regenerate both Vitamin C and glutathione in the body.*

~ Antioxidant Protection of Vitamin C*

Additional Information

GMP

Non-GMO

Natural color variation may occur in this product.

Studies suggest that Alpha-Lipoic Acid may further promote the body's utilization of Vitamin C, by activating uptake into cells via the glucose transport pathways.* Bioflavonoids also synergistically participate at the cellular level to create a well-absorbed, highly biologically available Vitamin C supplement.* Vitamin C is required for the synthesis of collagen, a structural component of blood vessels, tendons, ligaments and bone.*

~ Buffered, Non-Acidic ~ Enhanced Cellular Absorption*

CODE P0726 V5

Product Details

UPC / SKU 7 07359 10726 7
DSLD Entry Date 2017-01-25
Product Type Other Combinations
Form Tablet or Pill
DSLD ID 69322
Data Updated 2026-04-11

Research Evidence

371 Research Sources
54 Avg Quality Score
148 Meta Analysis
82 Systematic Review
71 Rct
62 Clinical Trial
2 Regulatory Source
1 Cochrane Review
1 Narrative Review
1 Other
1 Openfda Safety
A Vitamin C supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024
A Does Vitamin C Supplementation Provide a Protective Effect in Periodontal Health? A Systematic Review and Meta-Analysis
Meta Analysis International journal of molecular sciences 2024
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021
View all evidence for Vitamin C →

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