Correct!
The answer is: Calcium
From the article Ingredient Breakdown and Key Terminology:
What is Vitamin C (calcium ascorbate)?
Calcium ascorbate is the mineral calcium combined with vitamin C (ascorbic acid). This combination is well-absorbed from the digestive tract. Vitamin C supports the production of collagen and provides protection against damaging free radicals that can degrade connective tissue. Calcium ascorbate has been found to be very beneficial in restoring joint function and connective tissue health. As a mineral, calcium is vital for the formation of strong bones. It is also needed to reduce muscle cramping and for muscular growth and contraction.
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