Quick answer

Choose calcium citrate if you need a gentle, easily absorbed option, especially if you take it on an empty stomach. Choose algae calcium if you prefer a plant-based, whole-food mineral source that includes trace minerals.

Absorption and stomach sensitivity

Calcium citrate is known for being gentle on the stomach and can be taken with or without food. This makes it a practical choice for people with digestive sensitivity or those who take calcium between meals.

Algae calcium, sourced from plant-based algae, offers a different profile. It provides calcium along with other naturally occurring minerals, which may appeal to those seeking a more holistic mineral supplement.

Source and dietary preferences

If you follow a vegan or plant-based diet, algae calcium is a clear winner because it is 100% vegan and derived from a plant source. Calcium citrate is also vegan-friendly, but it is not derived from a whole-food source.

Both options support bone health, but algae calcium includes overall mineral support and cardiovascular health benefits, which may be important if you want more than just calcium.

Trade-offs to consider

  • Absorption: Calcium citrate absorbs well even without food, making it more flexible. Algae calcium also provides absorbable calcium, but it may be better taken with meals for optimal digestion. If you often skip meals, calcium citrate is more convenient.
  • Source: Algae calcium is derived from plant-based algae, ideal for vegans. Calcium citrate is also vegan but not a whole-food source. Choose algae calcium if you prefer a whole-food mineral supplement.
  • Extra benefits: Algae calcium includes trace minerals and supports cardiovascular health, while calcium citrate focuses on bone health and muscle/nerve function. If you want more than just calcium, algae calcium offers additional mineral support.

Product facts

  • Calcium Citrate Extra-Strength: Calcium Citrate Extra-Strength provides 500 mg of calcium citrate and is NSF Gluten-Free Certified, vegan, and gentle on the stomach. This form is easy on digestion and can be taken without food, making it a flexible option for daily use.

    Calcium Citrate Extra-Strength

    Calcium Citrate Extra-Strength

  • Algae Calcium: Algae Calcium is a 100% vegan, plant-based mineral source that supports bone strength, overall mineral support, and cardiovascular health. It offers a whole-food approach with additional minerals, appealing to those who prefer a plant-based supplement.

    Algae Calcium

    Algae Calcium

Who should choose which?

Best for

  • People with sensitive stomachs who need a gentle calcium supplement
  • Those who prefer a plant-based, whole-food mineral source

Not for

  • If you need a high-dose calcium supplement without extra minerals, calcium citrate may be more straightforward.
  • If you are on a tight budget, calcium citrate is more affordable.