Nordic Naturals Ultimate Omega Xtra Lemon

Our assessment

The evidence shows that Ultimate Omega Xtra Lemon by Nordic Naturals is a fish oil supplement providing omega-3 fatty acids. Our assessment is based on the available data for its active ingredients. While fish oil is widely used, the specific data provided here focuses on calcium, not omega-3s. For this product, the primary data on mechanisms, safety, and interactions comes from calcium, which is a separate ingredient and not the main component of this fish oil product. We must be transparent that the specific health effects of omega-3s from this formulation are not detailed in the provided data set.

How it works

Think of calcium as a key messenger for your body. It supports bone mineralization, which is the process of depositing minerals into your skeleton to keep it strong and dense. Calcium also plays a role in neuromuscular relaxation, helping your muscles relax and your nerves send signals properly [NIH ODS].

Safety profile

The FDA has received a total of 592,059 adverse event reports for products in this category. For the ingredient calcium, side effects from excessively high levels in the blood or urine can include poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. Some research also suggests that high calcium intakes might increase the risk of heart disease and prostate cancer [NIH ODS]. Data on side effects specific to the omega-3 content of this product is not provided.

Our recommendation

Based on the data for calcium, you should be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. For the specific omega-3 benefits and risks of this Nordic Naturals product, data is not available. We recommend consulting your healthcare provider before starting this supplement, especially if you take any of the listed medications or have concerns about calcium intake from other sources.

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide