Ingredient research hub
Vitamin D
A fat-soluble vitamin involved in calcium regulation, bone health, and normal neuromuscular function.
Vitamin D status is commonly assessed with serum 25-hydroxyvitamin D. Definitions of low status depend on the framework and clinical setting. Supplementation can address nutritional need, but it is not established as a universal treatment for fatigue or an energy booster.
Related research
Choose a specific evidence question below. Formula reviews provide label context; they do not establish that the complete product reproduces an ingredient study.
Healthy Aging
How Muscle Mass Changes With Age—and What Actually Helps Preserve ItMuscle mass, strength and function change differently with age. Use an evidence-informed order of priorities to decide what to address first.
Planet Wellness Report · Oct 22, 2026
Energy
Vitamin D and Fatigue: When Low Levels Matter and What Supplementation Can Actually DoLow vitamin D and fatigue can coexist. See what randomized trials show, why baseline status matters, and how guideline definitions and safety affect interpretation.
Planet Wellness Report · Oct 17, 2026
Nutrition
Advanced Muscle Plus Review: Where the Doses Match Research—and Where They Don’tThe dileucine amount resembles small human studies, but Advanced Muscle Plus has no verified finished-formula trial and conflicting official vitamin D information.
Planet Wellness Report · Oct 21, 2026
Products containing it
- Advanced Muscle Plus
Advanced BioNutritionals
A formula containing DL185 dileucine, calcium HMB monohydrate (myHMB), vitamin D, and calcium, marketed for muscle health and recovery. Ingredient research and manufacturer claims are distinct from finished-product evidence.
Product inclusion indicates a catalog relationship, not an efficacy endorsement.