Systemic C
by Source Naturals · capsule · 120 capsules
- On the market (NIH)
- UPC 0 21078 02158 2
- DSLD label 73838
- Serving 2 capsules
- 60 servings
Systemic C by Source Naturals lists 7 ingredients, 7 with an amount per serving of 2 capsules, such as 1,000 mg of vitamin C, 110 mg of calcium, 120 mg of N-acetyl cysteine and 100 mg of alpha-lipoic acid, beside 1 Nutrition Facts row (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on May 24, 2017.
What is in Systemic C?
Each row as the label prints it, per serving of 2 capsules. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Calories | 5 Calories | ||
| Total Carbohydrates | 1 g | 1% | 74% of 21,979 products listing carbohydrate give more (median 3 g). Per day at the most servings: 2 g. |
| Vitamin Cas Calcium AscorbateVitamin C (Form: as Calcium Ascorbate) | 1,000 mg | 1,667% | Higher than 91% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 2,000 mg. |
| Calciumas Calcium AscorbateCalcium (Form: as Calcium Ascorbate) | 110 mg | 11% | 51% of 17,831 products listing calcium give more (median 115 mg). Per day at the most servings: 220 mg. |
| N-Acetyl Cysteine | 120 mg | 57% of 1,259 products listing N-acetyl cysteine give more (median 150 mg). Per day at the most servings: 240 mg. | |
| Alpha-Lipoic Acid | 100 mg | Higher than 56% of 2,407 products listing alpha lipoic acid (median 50 mg). Per day at the most servings: 200 mg. | |
| Quercetin | 50 mg | 56% of 1,548 products listing quercetin give more (median 100 mg). Per day at the most servings: 100 mg. | |
| Citrus Bioflavonoid Complex | 40 mg | 59% of 2,343 products listing flavonoid give more (median 50 mg). Per day at the most servings: 80 mg. | |
| Grape seed extract | 30 mg | 65% of 1,900 products listing grape give more (median 50 mg). Per day at the most servings: 60 mg. |
Source: NIH ODS Dietary Supplement Label Database, label 73838 (entered May 24, 2017), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:
- Its 1,000 mg of vitamin C is higher than 91% of the 18,583 vitamin C products that print an amount; 445 list more.
The NIH database records 1 to 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
The products whose ingredient lists overlap most with Systemic C's, rare ingredients counting for more.
- Daily ImmuneUniversal Nutrition 5 shared, 60% alike
- Vitamin C 500 mg Plus Grape SeedQuest · off the market 4 shared, 53% alike
- Vitamin C with QuercetinIntegrative Therapeutics 4 shared, 46% alike
- C-1000Source Naturals Wellness 5 shared, 42% alike
- Ala+nacProCaps Laboratories 3 shared, 40% alike
- Super C 500 with Quercetin & ZincWindmill Natural Vitamins 4 shared, 40% alike
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Suggested Use: 2 capsules 1 to 2 times daily.
- Warnings
- Warning: Do not use if you are taking any form of prescription nitrate such as nitroglycerin. If you are pregnant, may become pregnant, breastfeeding, or taking any prescription drug, consult your health care professional before using this product.
- Do not use if either tamper-evident seal is broken or missing.
- Keep out of the reach of children.
- Allergens and what it does not contain
- Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
- Storage
- Store in a cool, dry place.
Source: label statements in DSLD label 73838.
What else is on the label?
Other ingredients: Gelatin, Maltodextrin, Silica, Magnesium Stearate.
How many labels does Systemic C have?
One label is on file, entered on May 24, 2017.
- Label 73838 (current) Entered May 24, 2017 · on the market · 120 capsules · UPC 0 21078 02158 2
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.