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Over time, many factors contribute to changes in our hair, nails, and skin. Dietary, environmental, genetic, and lifestyle factors all contribute to our physical appearance and well-being by affecting the pigmentation, elasticity, hydration, thickness, and fullness of the hair, skin, and nails. Our outward appearance is a reflection of our internal cellular and metabolic health. Dietary supplementation using specific, scientifically studied nutrients can help support our appearance as we age. AAI Rejuvenation Clinic and Douglas Laboratories are committed to staying at the forefront of new research where the science of supplementation and beauty intersect.


Our bones and joints play a critical role in the musculoskeletal system, a network that includes the muscles, ligaments, tendons, and other connective tissue. Normal aging leads to many changes in the musculoskeletal system that can cause decreased mobility and reduce your quality of life. Decreases in bone density, changes in cartilage and connective tissues, and altered muscle function can all occur during the normal aging process. Fortunately, a healthy diet, exercise, and proper supplementation can help us maintain healthy mobility and an active lifestyle well into our later years.


As we age, changes occur in many areas of our brain, notably in the prefrontal cortex and hippocampus, which can affect brain volume, neurotransmitter levels, protein and glucose metabolism, blood flow, and blood vessel structure. These changes may impact our memory recall, ability to perform tasks, emotional well-being, and compromise our overall quality of life. Factors such as genetics, diet, exercise and the environment can all influence cognitive health during the later years. Emerging research continues to focus on how we may be able to provide nutritional support for many of the normal, age-related changes in brain function.


In terms of surface area, the gastrointestinal tract is one of the largest organs in the body. It has many varied roles that extend well-beyond simply moving and digesting food to allow for nutrient absorption. In addition to acting as a barrier against the harsh external environment, the digestive system is one of the body’s largest immune organs, possessing an intricate lymph network. The gastrointestinal tract also houses a highly complex ecosystem that contains trillions of microorganisms. Research continues to uncover new ways in which these beneficial bacteria can positively impact health, expanding beyond the digestive tract to include cardiovascular health, cognition, weight, and more.


AAI Rejuvenation Clinic and Douglas Laboratories formulate products with the understanding that every patient is different and that each healthcare professional brings his or her own philosophy and clinical experience when working with a patient. We provide a wide selection of vitamin, mineral, and amino acid products to meet the unique biochemical and metabolic needs of each patient. Our selection of individual and multi-nutrient products gives the practitioner the ultimate ability to customize supplementation based on lab results, clinical presentation, and other individual parameters to provide personalized nutrition for each patient.


Cardiac and metabolic health is a broad topic that covers many areas from vascular function to glucose and lipid metabolism and body weight. As we age, the heart and vasculature undergo decreases in blood vessel plasticity and increases in blood vessel wall thickness. The function of the heart itself also changes, resulting in a decreased blood pumping efficiency. Normal aging also results in a loss of muscle mass and causes alterations in numerous metabolic pathways. Weight tends to increase, while metabolic processes such as glucose metabolism decrease. Together, this combination of factors can be viewed as cardiometabolic aging.


Our hormone levels often decrease as a consequence of normal aging. Our brain, bones, heart, skin, and muscles all depend on healthy levels of sex, thyroid, and adrenal hormones to function properly. These different hormones work together to support our mood, motivation, and drive. Hormones allow us to adapt to the demands and stresses of everyday life. Maintaining healthy and appropriately balanced hormones supports healthy aging, improves quality of life, and helps make an active lifestyle easier to maintain. Healthy hormone levels also support healthy sexual function, body weight, sleep, and blood sugar levels.


Athletes present a unique set of challenges and have individual needs. They may not be sick, but could be injured. They could be both energized and fatigued from their latest adventure, training session, or competition. The Klean Athlete product line provides a solid nutrient foundation, including the vitamins, minerals, and nutrients the body needs to perform at its best. Klean Athlete products fuel and fortify any athlete’s ability to optimize performance despite life’s daily stresses. They also promote an athlete’s overall health and wellness at any age, intensity, or experience level. Every bottle of Klean Athlete is tested and certified by the NSF Certified for Sport® program, and is designed to ensure safer sports nutrition. It is free from banned substances and contaminants. Whether you work with recreational athletes, active baby boomers, or professional athletes, Klean Athlete has a place in your practice.


The eyes are vital organs, but all too often we take them for granted and lose sight of the impact that normal aging, our diet, and the environment can have on our vision. During normal aging, free radicals and intense light radiation can contribute to changes in the membrane structure and function of eye cells, including those of the macula and retina. Nutrition is essential for maintaining healthy eyes as we age, and supplementation with specific well-researched nutrients can help to support healthy eye function.


Vitamins, minerals, and omega-3 fatty acids from the brick-and-mortar foundation of a healthy body. The 2015 Dietary Guidelines Advisory Committee reported that many Americans fall short in obtaining sufficient quantities of these important nutrients, including vitamins A, C, D and E, folate, calcium, magnesium, potassium, and fiber. Also, the prevalence of insufficient nutrient intake tends to increase with age. Thirty-five to 40 percent of older adults who do not take supplements have inadequate B-6 intake, and older adults often have difficulty obtaining enough B-12 from their diet. Supplementation with multivitamins, minerals and omega-3 fatty acids can play a valuable role in helping to fill these gaps.

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