Klean Athlete

KLEAN-D

$17.50

SIZE: 100 tablets

*Free shipping applies to orders shipped within the Lower 48 States.

Free shipping on orders over $99.

The Promise

High‑potency Vitamin D3 — 5,000 IU cholecalciferol per tablet

A single tablet delivers a concentrated dose of natural vitamin D3 designed for athletic needs.

Strong dose for athletes

Each tablet provides 5,000 IU of vitamin D‑3 (cholecalciferol).

Bioavailable, natural form*

Uses cholecalciferol (vitamin D‑3), the naturally occurring form commonly used for supplementation.

Third‑party sport certification

NSF Certified for Sport® ensures testing for content, purity, and banned substances.

Quality tablet formulation

Prepared with excipients like cellulose, croscarmellose sodium, calcium carbonate, silica, and vegetable stearate.

Why It Works

How this formulation helps — Form, dose, and practical safety details*

Key formulation facts that affect dosing and safe use.

01

Fat‑soluble vitamin

Vitamin D3 is fat‑soluble, so it is formulated to be taken with dietary fat for optimal absorption.*

02

Clinic‑level dosing

The 5,000 IU strength provides a higher maintenance dose commonly used when higher vitamin D status is needed.

03

Monitoring note for higher intake

People consuming more than 2,000 IU per day may wish to have vitamin D blood levels checked by a healthcare professional.

04

Athlete‑focused purity

NSF Certified for Sport® confirms the product has been tested to reduce the risk of banned substance contamination for competitive athletes.

Reviews

Customer Reviews

Your Journey

How to use it — Serving, timing, storage, and safety

Practical directions and considerations for daily use.

Serving

One tablet daily

Adults take one tablet daily.

Take with food

Use with a fat‑containing meal

Take the tablet with a meal that includes fat to support absorption of the fat‑soluble vitamin.

Storage

Keep cool and dry

Store in a cool, dry place away from direct light and keep out of reach of children.

Higher intake monitoring

Consider level checks for higher daily intake

Those taking more than 2,000 IU per day may consider having vitamin D blood levels checked by a healthcare professional.

Product education

KLEAN-D (Vitamin D3) by Klean Athlete

Klean-D is a premium dietary supplement that delivers 5,000 I.U. of natural vitamin D3 per tablet, specially formulated to support the unique needs of athletes. Often called the “sunshine vitamin,” vitamin D is a crucial regulatory hormone that influences a wide range of physiological processes, from immune function to musculoskeletal health. Given that many athletes, especially those who train indoors or live in northern climates, are at risk of vitamin D deficiency, Klean-D provides a potent and bioavailable solution.*

Adequate vitamin D levels are essential for proper calcium absorption and maintaining healthy plasma calcium, which are fundamental for strong bones and overall skeletal integrity. Beyond bone support, this vital nutrient modulates cell growth, supports neuromuscular function, and plays a key role in a healthy inflammatory response. Clinical research has demonstrated a positive correlation between vitamin D status and physical performance, including muscle strength and recovery after intense exercise. By ensuring your body has optimal vitamin D levels, Klean-D helps combat muscle pain, weakness, and reduced performance associated with deficiency.*

Klean-D is also backed by the NSF Certified for Sport® Program, an assurance that every product has been rigorously tested for content, purity, and freedom from banned substances. This certification provides peace of mind for athletes and healthcare professionals, ensuring the supplement is safe and compliant with professional athletic standards. For optimal absorption, this fat-soluble vitamin should be taken with a meal that contains fat.*

  • Supports a healthy immune system and overall immune function.*
  • Aids in maintaining strong bones and musculoskeletal health.
  • Enhances physical performance, muscle strength, and recovery in athletes.*
  • NSF Certified for Sport®, guaranteeing safety and purity.

Supplement record

Review serving details and ingredients for this product.

  Supplement Facts:
Suggested Use: Adults take one tablet daily with a fat-containing meal or as directed.
Serving Size: 1 Tablet
Servings Per Container: 100
Ingredient Amount %DV
Vitamin D-3 (cholecalciferol) 5,000 IU 1,250%
Other ingredients: Cellulose, croscarmellose sodium, calcium carbonate, silica and vegetable stearate.
Note: People consuming more than 2,000 IU per day should have their vitamin D blood levels monitored by a healthcare professional.
Storage: Store in a cool, dry place, away from direct light. Keep out of reach of children.