Product Description
Endurance athletes put more stress on their bones than they realize. From daily running to heavy strength blocks; it's something your body can adapt to but only if it has the raw materials it needs.
Klean Athlete Calcium (Citrate) delivers highly bioavailable calcium citrate to support bone density, muscle contraction, and cardiovascular health in athletes
Citrate Form = Superior Absorption – Calcium citrate is absorbed up to 24% more efficiently than calcium carbonate, and unlike carbonate, it doesn't need to be taken with food. For athletes with high training volumes or variable eating schedules, this flexibility and absorption advantage matters.
Bone Density That Holds Up to Training – Calcium is the primary mineral in bone tissue. Consistent daily intake helps maintain the bone density that absorbs impact, resists stress fractures, and keeps you training through long seasons without breaking down.
Muscle Contraction and Cardiovascular Function – Calcium isn't just a bone mineral. It's the trigger for every muscle contraction in your body — skeletal, smooth, and cardiac. Adequate calcium levels support proper muscle function and healthy blood vessel operation, which matters directly for performance and recovery.
How to Use Klean Athlete Calcium (Citrate)
Dose: Take 2 capsules, 1–3 times daily with a meal, or as directed by a trainer, coach, or healthcare professional. With 120 capsules per container and up to 3 servings daily, a single bottle provides 20–60 days of supply depending on your individual needs. Athletes with higher training loads or low dietary calcium intake (dairy-free, plant-based) should aim for the higher end of the dosing range.
Pro tip: Pair with Vitamin D3 to maximize calcium absorption — D3 is the key that unlocks calcium uptake in the gut.
NSF Certified for Sport, vegan-friendly, gluten-free, and non-GMO. No artificial colors, flavors, or sweeteners. Built to the same clean standard as every product in the Klean Athlete lineup.
- Gluten free
- Vegan
Supplement Facts
60 Servings
Serving Size: 2 Capsules
Serving Per Container: 60
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Calcium (as calcium citrate) 300mg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Klean Athlete Calcium (Citrate) FAQ's
Everything you need to know about Klean Athlete Calcium (Citrate).
Klean Calcium Citrate is a highly bioavailable calcium supplement delivering 300mg of calcium citrate per serving, designed for athletes who need reliable daily calcium support for bone health, cardiovascular function, and long-term performance. It's NSF Certified for Sport, vegan, gluten-free, and non-GMO.
Calcium citrate is significantly better absorbed than calcium carbonate — the form found in most cheap calcium supplements — and doesn't require stomach acid to be absorbed, meaning it works with or without food. For athletes who train hard and eat inconsistently, that flexibility and absorption advantage matters.
High training loads increase calcium losses through sweat, and endurance athletes who restrict calories or avoid dairy are particularly at risk for insufficient calcium intake. Chronically low calcium over time is a direct risk factor for stress fractures and reduced bone density — two problems that end seasons and careers.
Take two capsules one to three times daily with a meal. Spreading doses throughout the day rather than taking them all at once improves absorption, since the body can only utilize a limited amount of calcium at a time.
Yes — calcium works best alongside Vitamin D3, which is essential for calcium absorption and bone metabolism. If your daily stack doesn't already include Vitamin D3, pairing Klean Calcium Citrate with Klean D3 is the most logical combination for complete bone health support.