GNC Women's Hair, Skin & Nails Program Advanced Collagen Formula
Brand: GNC Women's · Form: CAPSULE [E0159] On Market
Our assessment
The evidence shows that GNC Women's Hair, Skin & Nails Program Advanced Collagen Formula contains calcium, a mineral with established roles in bone health and nerve signaling [NIH ODS]. However, based on the data provided, we cannot assess the effectiveness of the other ingredients in this specific formula for hair, skin, or nail benefits, as no specific data on those ingredients was supplied. You should be aware of the known risks and interactions associated with calcium supplementation before starting this product.
How it works
Think of calcium as a structural and signaling mineral. It supports bone mineralization, meaning it helps deposit minerals into your bone tissue to maintain density and strength [NIH ODS]. It also plays a role in neuromuscular relaxation, which supports proper muscle contraction and nerve signal transmission [NIH ODS]. This foundational role is why calcium is often included in formulas aimed at supporting overall structure, including skin, hair, and nails.
Safety profile
The FDA has received a total of 592,059 adverse event reports for products in this category [FDA data]. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer according to some research [NIH ODS]. Very high levels of calcium in the blood and urine can lead to 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].
Our recommendation
Proceed with caution. Before taking this supplement, review your total daily calcium intake from food and other supplements. Calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these, separate your doses by at least two hours, or consult your doctor. Data not available on the specific collagen or other active ingredients in this formula, so its targeted benefits for hair, skin, and nails are unconfirmed by the provided data.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | GNC Women's |
|---|---|
| Serving Size | |
| Contents | 30.0 Capsule(s) |
| Market Status | On Market |
How to Read This Label
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