USANA ACTIVE CALCIUM PLUS
WHAT IS ACTIVE CALCIUM?
Active Calcium is designed to provide adequate supplemental amounts of nutrients essential for good bone health. It contains a balanced formula of calcium, magnesium, silicon, and vitamin D.WHY IS CALCIUM CARBONATE USED IN ACTIVE CALCIUM?
The absorption and utilization of calcium carbonate and calcium citrate are bioequivalent when taken with food and adequate vitamin D. At present, the amount of elemental calcium in the Active Calcium is 200 mg per tablet. It is not possible to provide this advanced amount of calcium from calcium citrate alone because calcium citrate contains less elemental calcium (by weight).
Thus, to reach a more advanced amount of elemental calcium without significantly increasing tablet size, a mixture of citrate and carbonate is used.
Thus, to reach a more advanced amount of elemental calcium without significantly increasing tablet size, a mixture of citrate and carbonate is used.
WHY ARE YOU USING A MIXTURE OF CALCIUM CARBONATE AND CALCIUM CITRATE?
Calcium carbonate contains more calcium (by weight) than calcium citrate. By adding calcium carbonate to USANA formulas, we are able to make the tablets smaller while still maintaing a good amount of elemental calcium.
We are occasionally asked what the ratio of citrate to carbonate is in our products. Because that ratio is part of a proprietary formula, we are not able to give out information regarding the specific percentage of calcium carbonate and citrate in the Essentials and Active Calcium products.
We are occasionally asked what the ratio of citrate to carbonate is in our products. Because that ratio is part of a proprietary formula, we are not able to give out information regarding the specific percentage of calcium carbonate and citrate in the Essentials and Active Calcium products.
DO CALCIUM SUPPLEMENTS CONTRIBUTE TO THE FORMATION OF KIDNEY STONES?
Kidney stones affect approximately 12% of the American population, and calcium oxalate stones account for almost 90% of kidney stone incidence. Oxalates are organic chemicals found in certain foods (such as spinach and beets) that may combine with calcium to form calcium oxalate, an insoluble chemical the human body cannot use.
Since 20-40% of recurrent kidney stones have been associated with elevated urinary calcium, it was originally thought that consumption of high amounts of calcium might cause or contribute to stone formation. However, recent research has shown that calcium restriction may actually increase the risk of kidney stones under certain conditions.
Many studies have investigated the role of nutrition in helping to reduce kidney stones. A study conducted by Brigham and Women’s Hospital andHarvard Medical School found that previous recommendations to limit dairy products in an effort to reduce the risk of kidney stones were misguided. This study – conducted on more than 90,000 women – showed that “women with the highest intake of dietary calcium had the lowest risk of kidney stones.” This study suggests that calcium may actually have a protective effect by binding to oxalate in the gut and preventing its absorption into a form that leads to kidney stones.
Another large-scale study on calcium and kidney stones concluded that high calcium intake decreases the risk of symptomatic kidney stones. Perhaps just as importantly, the study found that individuals consuming less than 850 mg of calcium per day actually had a higher incidence of kidney stones.
In general, the intake of calcium through food and/or supplements does not contribute to an increased incidence of kidney stones. In fact, with very few exceptions, getting adequate dietary calcium actually reduces your risk for kidney stones.
Note: it is best to take calcium supplements with meals (rather than between meals) to most effectively inhibit oxalate absorption.
CALCIUM
Calcium is the most abundant mineral in the body. It is needed for strength and structure of teeth and bones, blood clotting, nerve function, muscle contraction and relaxation, enzyme regulation, and membrane permeability.
Most of the calcium in the human body is found in teeth and bones. This amount is continually in flux, with various amounts being deposited and resorbed. Later in life, more calcium is resorbed than is replaced, leading to bone loss and potentially to osteoporosis if calcium intake is inadequate (or has been inadequate in the past).
Good sources of calcium are broccoli, legumes, fortified orange juice, dairy products, and fish. Many dairy products are also fortified with vitamin D, which plays an important role in calcium absorption.
The recommended dietary allowance of calcium for adults ages 19 to 50 is 1000 mg/day. Pregnant or lactating women and adults over 50 should get 1200 mg/day. Adverse effects of calcium in normal adults have been observed only with chronic intakes above 2500 mg/day.
Good sources of calcium are broccoli, legumes, fortified orange juice, dairy products, and fish. Many dairy products are also fortified with vitamin D, which plays an important role in calcium absorption.
The recommended dietary allowance of calcium for adults ages 19 to 50 is 1000 mg/day. Pregnant or lactating women and adults over 50 should get 1200 mg/day. Adverse effects of calcium in normal adults have been observed only with chronic intakes above 2500 mg/day.
HOW MUCH CALCIUM SHOULD I BE TAKING?
Based on typical dietary averages, women obtain about 744 mg per/day of calcium and men 975 mg per day of calcium in their diet. Adding the 270 mg in a full daily dosage of Essentials brings most adults with a typical diet to a safe and adequate range somewhere around 1,050 mg – 1,250 mg. The Active Calcium optimizer is most appropriate for people avoiding dairy or with poor calcium intake, or those at much higher risk of osteoporosis. It can be added in increments of 200 mg of calcium per tablet, to help bring the calcium obtained from all sources (diet and supplements) up to the Recommended Dietary Allowance (RDA) for that individual.
Recommended Dietary Allowances (RDAs) for calcium
| Age (years) | Male (mg/day) | Female (mg/day) | Pregnant (mg/day) | Lactating (mg/day) |
| 4-8 years | 1,000 mg | 1,000 mg | N/A | N/A |
| 9-13 years | 1,300 mg | 1,300 mg | N/A | N/A |
| 14-18 years | 1,300 mg | 1,300 mg | 1,300 mg | 1,300 mg |
| 19-50 years | 1,000 mg | 1,000 mg | 1,000 mg | 1,000 mg |
| 51-70 years | 1,000 mg | 1,200 mg | N/A | N/A |
| 71+ years | 1,200 mg | 1,200 mg | N/A | N/A |
CALCIUM SUPPLEMENTATION INCREASES BONE MINERAL MASS AND HEIGHT IN ADOLESCENT BOYS
Bone mineral content, bone area, lean and fat mass, height, and weight were measured before, during and following the treatment period. They were also grouped according to activity level.
Both groups experienced increases in height, weight, lean and fat mass and most bone measurements over the course of the study. However, the group receiving calcium was found to have a significant increase in height, lean mass and bone mineral content of the whole body, lumbar spine and hip compared to the boys who received a placebo. Physical activity level increased the effect of calcium supplementation on bone mineral content only in an area of the upper leg bone.
Calcium supplementation early in life may improve bone mineral content and stature and help reduce future osteoporotic fractures.
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EDWIN LOH
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