Sports Research

Vitamin D3 2500 IU

$48.00
Description

Vitamin D, often referred to as the "sunshine vitamin," is a crucial micronutrient that supports calcium absorption, strong bone development, and a healthy immune system. For individuals with limited sun exposure, such as during winter months, or those looking to minimize the risks of UVA and UVB exposure, our Sports Research Vitamin D3 formula provides the same biologically active form of vitamin D that the body produces from sunlight. Additionally, since D3 is most effective when taken with a fat, we have included coconut MCT oil in our softgels to ensure optimal absorption.

Suggested Use

TAKE 1 SOFTGEL DAILY WITH A FAT-CONTAINING MEAL

D3 is fat-soluble — it is absorbed alongside dietary fats. The built-in coconut MCT oil carrier provides a fat source even on an empty stomach, but taking with a meal further enhances absorption. Consistent daily use is essential: D3 levels build gradually over 2–3 months of supplementation before stabilising.

Ingredients

Organic Coconut Oil (MCT), Softgel Capsule (Gelatin, Glycerin, Purified Water).

Storage

Store at room temperature, in a dry place. Protect product from excessive heat, freezing, humidity and light.

Shipping

We offer free shipping on orders over $95. Orders processed in United States and Canada will take 1-2 business days to arrive. Delivery details will be provided in your confirmation email.
VITAMIN D3 · SPORTS RESEARCH · 2,500 IU

You're probably deficient right now.

Vitamin D is not a vitamin — it's a hormone precursor that governs over 200 genes. Most people living indoors, in northern latitudes, or with limited sun exposure are chronically deficient. Supplementation is the only reliable fix.
See the science
VITAMIN D3 · SPORTS RESEARCH · 2,500 IU

Quality & Safety

Backed by Trusted Certifications

Third Party Tested

Third Party Tested

for Purity, heavy metals and contaminants

Gluten Free

Gluten Free

Gluten-Free

Non-GMO

Non-GMO

IGEN™ Non-GMO Tested

Made in USA

Made in USA

Manufactured in the United States
The silent deficiency

The world's most common nutrient gap.

1B+
People worldwide estimated to be deficient in vitamin D
200+
Genes in the body regulated by vitamin D receptors
42%
Of US adults have insufficient vitamin D levels
120
Softgels per bottle — a full 4-month supply at 1 per day
Sunlight triggers D3 synthesis in the skin, but modern indoor lifestyles, sunscreen use, glass windows, seasonal changes, and darker skin tones all reduce natural production. A supplement isn't a luxury — for most people, it's a necessity.
EVIDENCE-BASED BENEFITS

What sufficient vitamin D actually does.

These are the benefits of correcting deficiency — supported by large-scale RCTs and systematic reviews, not mechanistic speculation alone.

Bone health

Without sufficient vitamin D, intestinal calcium absorption falls to 10–15%. With it, absorption rises to 30–40%. This difference is the primary driver of bone mineralisation, density maintenance, and fracture risk reduction across the lifespan.

Holick (2007) · New England Journal of Medicine

Immune function

Daily or weekly vitamin D supplementation reduced the risk of acute respiratory tract infections by 12% overall, and by 70% in individuals who were severely deficient at baseline.

Martineau et al. (2017) · BMJ

Mood & energy

Vitamin D receptors in the hippocampus and prefrontal cortex suggest a direct neurological role. Supplementation in deficient individuals produces measurable improvements in mood, energy, and cognitive clarity.

Shaffer et al. (2014) · Psychosomatic Medicine

Muscle strength

Correcting deficiency improves muscle strength, balance, and reaction time — with effects documented in both older and younger athletic populations.

Bischoff-Ferrari et al. (2009) · Archives of Internal Medicine
QUESTIONS

Answered plainly.

  • The official tolerable upper intake is4,000 IU/dayfor adults (Health Canada / NIH). Most research showing meaningful benefits uses1,000–2,000 IU daily. If your bloodwork shows deficiency (25(OH)D < 50 nmol/L), a clinician may recommend a short-term higher loading dose. Our D3 delivers 2,000 IU per softgel — a sensible daily dose for most adults.

  • D3 (cholecalciferol) is the form your body produces naturally from sunlight and is more effective at raising blood levels. D2 (ergocalciferol) is plant-derived and less potent. We use only D3 for maximum bioavailability.

  • Yes. D3 is fat-soluble, meaning it absorbs significantly better when taken with a meal containing fat. A 2010 study found taking D3 with the largest meal of the day increased blood levels by about 50% compared to fasting. Breakfast with eggs or avocado, or dinner with any dietary fat, works well.

  • Deficiency is widespread — Symptoms can be subtle: fatigue, low mood, muscle weakness, bone aches, and frequent illness. The only reliable way to confirm deficiency is a serum 25(OH)D blood test. Ask your doctor to include it in your next routine panel.

  • Sun exposure varies by latitude, season, skin tone, and sunscreen use. Most people cannot reliably produce adequate vitamin D year-round from sunlight alone. Supplementation ensures consistent, measurable intake.

  • Blood levels typically rise within 2–4 weeks of consistent supplementation. For deficiency correction, 8–12 weeks is standard. We recommend testing at baseline and again after 3 months to track progress.