Feature
Vitamin A
Glycine
Typical Dosage
700–900 mcg RAE daily (adults)
3-5g daily
Best Form
Retinyl Palmitate
Powder
Key Benefits
5
6
Evidence Rating
★★★★
★★★★
Best Time
With food containing fat for optimal absorption
Evening for sleep benefits; anytime for general health
Vitamin A Benefits
✓Supports healthy vision and prevents night blindness
✓Enhances immune system function and disease resistance
✓Promotes skin health and reduces acne
✓Supports bone health and calcium absorption
✓Protects against age-related macular degeneration
Glycine Benefits
✓Improves sleep quality and sleep onset
✓Supports collagen formation and joint health
✓Enhances cognitive function and memory
✓Reduces muscle wasting and supports muscle recovery
✓Promotes relaxation and reduces anxiety
✓Supports immune function
Can You Take Both Together?
In most cases, Vitamin A and Glycine can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication.
Which Should You Choose?
Choose Vitamin A if your primary goal is: supports healthy vision and prevents night blindness. Choose Glycine if your primary goal is: improves sleep quality and sleep onset. Many people take both as they target different aspects of health.
Disclaimer: This comparison is for educational purposes only. Always consult a healthcare professional before starting any supplement.