vitamin c and glutathione serum Allies of Skin 35% & Advanced Firm + Brighten Glutathione + GAP technology (glutathione amino acid precursors) work to minimise irritation while amping up antioxidant protection and ingredient stability Paula's Choice 25% Vitamin C

Specific pathogen-free (SPF) grade Balb/c mice (68 weeks old, female, n = 10 per group) were purchased from Shanghai SLAC Laboratory Animal Co., Ltd

The trials consisted of 162 women, aged 1865, and reported results that include: Clinical measurements: 26% increase in skin radiance after two months 40% increase in radiance after three months 65% improvement in skin uniformity after three months Consumer perception: 100% of participants showed increased skin radiance within two months Additionally, key ingredients have been shown to optimize antioxidant defenses and promote the skin's resilience to environmental stressors.* Be one of the first to try USANA's revolutionary Glow by visiting usana.com

Muscle tissue changes with aging

Vitamin B5 (pantothenic acid): Pantothenic acid is involved with cellular energy metabolism and synthesizing the neurotransmitter acetylcholine, which is involved with muscle contraction, memory, motivation, and learning