N by Nutrilite Slay the Day Strawberry Lemonade

Our assessment

The evidence shows that N by Nutrilite Slay the Day Strawberry Lemonade contains calcium as its primary active ingredient. Based on the data, calcium is a critical mineral for bone and muscle function, but you need to be aware of specific safety considerations and medication interactions [NIH ODS].

How it works

Think of calcium as a structural and signaling powerhouse. It supports bone mineralization, helping to maintain your bone density, and it also plays a key role in neuromuscular relaxation, meaning it helps your muscles relax and your nerves send signals properly [NIH ODS].

Safety profile

Data not available on specific side effects for this product. However, for calcium generally, high intakes may increase the risk of heart disease and prostate cancer. High blood and urine levels of calcium can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent urination, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. The FDA has received a total of 592,059 adverse event reports across all dietary supplements, though this number is not specific to this product [FDA data].

Our recommendation

You should be aware that calcium can reduce the absorption of several important medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these medications, take this supplement at a different time of day. Always consult your pharmacist or doctor before adding this to your routine, especially if you have a history of kidney stones or heart conditions [NIH ODS].

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