Understanding Vitamin D3 Cholecalciferol

What Is It?

Understanding Vitamin D3 Cholecalciferol

Vitamin D works like both a nutrient and a hormone: it helps the body absorb calcium and phosphorus, builds strong bones, and supports the immune system.

We make most of it in our skin when sunlight (UV‑B rays) hits us, but only a few foods—mainly oily fish, fish‑liver oil, egg yolks, cheese, and beef liver—supply meaningful amounts. That’s why many people rely on supplements.

Two forms exist: plant‑based vitamin D2 (ergocalciferol) and animal‑based vitamin D3 (cholecalciferol).

Research shows D3 raises and maintains blood vitamin‑D levels more effectively than D2, making D3 the preferred choice for topping up daily needs when sunshine or diet alone falls short.

How It Works?

How Vitamin D3 Cholecalciferol Works?

Vitamin D3 aids in making our bodies better at absorbing other nutrients, particularly, calcium and phosphorus, which are both important for bone health. Vitamin D3 also helps to restore and maintain the calcium in our bones, which is where 99% of calcium resides.

Without sufficient vitamin D3, your body doesn’t absorb calcium from the food you eat; consequently, your bones become a source of calcium, because the human body is always seeking the level of calcium that it optimally needs. Therefore, the downstream effect and result is a loss of calcium from your bones and a subsequent deterioration in overall bone health, density, and function.

Vitamin D3 also supports the immune system, helps muscles contract and relax properly, prevents calcium imbalances, and balances key hormones linked to muscle growth, performance, recovery (like testosterone), mood regulation (serotonin and dopamine), and appetite control (leptin).

Benefits

OVERALL TAKEAWAY

While vitamin D3 is most well-known for promoting superior bone health, it is an extremely versatile and must-have supplement that is also very important for boosting immune system strength, enhancing muscle function, and supporting strong cardiovascular, mental, metabolic, and gut/digestive/hormonal health, in addition to providing benefits to optimize cognitive function and body composition.

Every Day Impact of Vitamin D3 Cholecalciferol Supplementation and Science-Backed Results You Can Trust

Bone Health:
Vitamin D3 is essential for maintaining strong bones. It helps your body absorb calcium and keeps bones dense and healthy, protecting you from conditions like osteoporosis.

Muscle Performance:
Vitamin D3 helps muscles contract, relax, and recover effectively after exercise. It supports healthy muscles by reducing inflammation and promoting muscle repair, which means better strength and performance.

Mood and Brain Health:
Vitamin D3 boosts mood and brain health by regulating chemicals in your brain (like serotonin and dopamine) that influence mood, learning, and memory. Healthy vitamin D levels are linked to less anxiety and depression.

Weight Management and Body Composition:
Vitamin D3 supports healthy digestion and hormone levels, promoting better muscle growth and fat burning. This helps improve your body composition, meaning more muscle and less fat.

Healthy Skin:
Vitamin D3 aids in skin cell renewal, helps strengthen your skin barrier, improves skin texture and tone, and may help manage conditions like psoriasis and eczema.

Proven Results and Science-Backed Benefits:
Recent studies show Vitamin D3 supplementation, especially when combined with other nutrients like HMB, helps maintain muscle mass, strength, and function, especially in older adults. For example, daily supplementation with Vitamin D3 and HMB improved muscle strength, reduced inflammation, and increased mobility in older individuals (Fairfield et al., 2022; Rathmacher et al., 2020; Nasimi et al., 2021; Pereira et al., 2022).

Vitamin D3 alone also has strong, proven health benefits:

Bone Health: Research confirms that supplementing vitamin D3 significantly reduces the risk of fractures in older adults (Boonen et al., 2007).

Immune Support: Vitamin D3 boosts your immune system, helping your body fight infections like colds and flu, and reduces harmful inflammation (Cannell et al., 2006; Ginde et al., 2009).

In short, regular Vitamin D3 supplementation supports strong bones, better muscle function, improved mood, healthier weight management, radiant skin, and robust heart and immune health—making it an essential nutrient for daily wellness.

Be KRE18 Elite, No Limits!

he KRE18 Elite Team and Community, all dedicated athletes, and demanding training sessions and consistent high-performance efforts require only the highest quality supplements to reliably and steadily maximize results, especially, long-term. The KRE18 Pre-Workout Booster ready-to-drink product includes a safe, pure 10-microgram dose of Vitamin D3 Cholecalciferol, can be taken as a science-backed, results-driven performance-enhancement supplement whenever you may need it most, and would be the perfect, next-level addition or superior alternative to your current pre-workout supplementation stack.

Additionally, the KRE18 Muscle Fuel and Recovery ready-to-drink product also includes a safe, pure 10-microgram dose of Vitamin D3 Cholecalciferol and would be the ideal, game-changing addition or superior alternative to your current post-workout and muscle support, growth, and/or recovery supplementation stack.

Above all, our KRE18 Products containing Vitamin D3 Cholecalciferol give you the tools you need to be at your peak performance, from the inside-out, with a truly innovative, cutting-edge approach.

Written By

Dr. Matt Gaston Villanueva, Ph.D.

Chief Scientific Officer,

KRE18 Performance