Calcium Citrate 300 mg by Klean Athlete

If you’re choosing a calcium supplement because your diet is light on dairy or fortified foods, calcium citrate is the practical pick. It absorbs well even with low stomach acid, so it suits adults on proton pump inhibitors (acid-suppressing drugs for reflux), post‑menopausal women, vegans, and people after bariatric surgery. If your Vitamin D, 25-Hydroxy is low, fix that too—calcium works far better when vitamin D is replete. For those with a history of calcium oxalate stones, taking calcium with meals can reduce oxalate absorption.

Your skeleton is a mineral bank that your body deposits into and withdraws from, regulated by parathyroid hormone (the signal that pulls calcium from bone) and vitamin D. Calcium citrate provides elemental calcium to keep that balance steady, and the citrate part does not require much stomach acid to dissolve. In the gut it binds dietary oxalate, and in the urine citrate can reduce crystal formation, which is why clinicians often prefer citrate over carbonate in stone‑prone patients. Bone density shifts over months to years, not weeks.

Follow the label: 2 capsules with a meal, 1–3 times daily. Split doses of 300–500 mg at a time absorb better than one large dose. Take calcium citrate with food to pair it with dietary oxalate and improve uptake. Keep it a few hours apart from iron or zinc to avoid competition, and separate it from levothyroxine (thyroid medicine) and oral bisphosphonates by at least 4 hours. Check Vitamin D, 25-Hydroxy and aim for adequacy before judging calcium’s effect.

Calcium binds many drugs in the gut. Space it from levothyroxine, tetracycline or quinolone antibiotics, and oral bisphosphonates. Thiazide diuretics (blood‑pressure meds like hydrochlorothiazide) raise blood calcium; combining them with calcium supplements needs clinician oversight with periodic Calcium, Serum and possibly PTH checks. Large calcium doses can reduce absorption of iron and zinc—take those at a different time of day.

Avoid supplemental calcium if you have high blood calcium, untreated hyperparathyroidism, granulomatous diseases like sarcoidosis, or advanced kidney disease—get medical guidance first. If you form calcium phosphate stones, you still need meal‑time calcium, but total dose and 24‑hour urine calcium should guide use. If your dietary intake is already robust, extra calcium adds constipation and cost without bone benefit. Klean Athlete Calcium Citrate is best as a gap‑filler, not a blanket add‑on.