PlainVitamins

Zenapin-IR

by Rejuvica Health · liquid · 2 fluid ounces

  • On the market (NIH)
  • DSLD label 259456
  • Serving 1.23 ml (1/4 tsp)
  • 48 servings

Zenapin-IR by Rejuvica Health lists 8 ingredients, 4 with an amount per serving of 1.23 ml, such as 400 mcg of thiamine, 0.8 mcg of cyanocobalamin, 133 mcg of folic acid and 433 mcg of pyridoxine; 4 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on February 23, 2022.

What is in Zenapin-IR?

Each row as the label prints it, per serving of 1.23 ml. 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).

Zenapin-IR: Supplement Facts rows against the market (DSLD label 259456, January 2026 release)
IngredientAmount% DVAmong products listing it
Thiamineas Vitamin B1400 mcg33%Thiamin in Zenapin-IR against 9,830 products0.4 mg per serving; the middle half of products list 1.5 mg to 25 mg, the median 5 mg.DV 1.2 mg0.4 mg

93% of 9,830 products listing thiamin give more (median 5 mg). Per day at the most servings: 2.4 mg.

Cyanocobalaminas Vitamin B120.8 mcg33%Vitamin B12 in Zenapin-IR against 14,425 products0.8 mcg per serving; the middle half of products list 6 mcg to 200 mcg, the median 36 mcg.DV 2.4 mcg0.8 mcg

98% of 14,425 products listing vitamin B12 give more (median 36 mcg). Per day at the most servings: 4.8 mcg.

Folic Acid133 mcg33%Folate in Zenapin-IR against 7,022 products133 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.133 mcg

85% of 7,022 products listing folate give more (median 400 mcg). Per day at the most servings: 798 mcg.

Pyridoxineas Vitamin B6433 mcg33%Vitamin B6 in Zenapin-IR against 15,277 products0.433 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg0.433 mg

97% of 15,277 products listing vitamin B6 give more (median 6 mg). Per day at the most servings: 2.6 mg.

Proprietary Blend1.23 mL
Kava Kavain the blend, no amount given
Passionflowerin the blend, no amount given
Ashwagandhain the blend, no amount given
Chamomilein the blend, no amount given

Source: NIH ODS Dietary Supplement Label Database, label 259456 (entered February 23, 2022), 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:

  • 93% of the 9,830 products that print an amount of thiamin list more than its 0.4 mg of thiamin (median 5 mg).
  • 98% of the 14,425 products that print an amount of vitamin B12 list more than its 0.8 mcg of cyanocobalamin (filed by NIH under vitamin B12) (median 36 mcg).
  • 97% of the 15,277 products that print an amount of vitamin B6 list more than its 0.433 mg of pyridoxine (filed by NIH under vitamin B6) (median 6 mg).

The NIH database records 3 to 6 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 Zenapin-IR's, rare ingredients counting for more.

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: As a dietary supplement take 1/4 teaspoon (two squeezes of the bulb) 3-6 times a day or as needed. Take with a full glass of water.
Warnings
Warning: Consult a qualified healthcare practitioner prior to using herbal products, particularly if pregnant, nursing, or on medications.
Discontinue two weeks before scheduled surgery.
Storage
Store in a cool, dry place with lid tightly closed. Do not expose to excessive heat.

Source: label statements in DSLD label 259456.

What else is on the label?

Other ingredients: Glycerin, Water, Purified.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Strict third party testing Good Manufacturing Practice GMP Certified.

How many labels does Zenapin-IR have?

2 labels are on file under this name since December 26, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 259456 (current) Entered February 23, 2022 · on the market · 2 fluid ounces
  2. Label 240970 Entered December 26, 2020 · off the market August 11, 2021 · 2 ounces

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Rejuvica Health (distributor), Irvine, CA. All Rejuvica Health products.

Where next?