The Truth About Supplements

When it comes to supplements, many people assume that if a product is available on a pharmacy or health food store shelf, it must be effective, well-regulated, and appropriate for everyone. Unfortunately, the reality is far more complex.

One of the biggest differences between retail supplements and practitioner-prescribed supplements is the level of individualisation, formulation quality, and clinical oversight involved.

Retail supplements are designed for the general population. They are mass-produced to appeal to as many consumers as possible and are often marketed using broad health claims such as “supports energy,” “immune health,” or “general wellbeing.” While some retail products can be useful, many contain relatively low doses of active ingredients, cheaper forms of nutrients with reduced absorption, unnecessary fillers, or combinations that may not be appropriate for an individual’s specific health needs.

In contrast, practitioner-prescribed supplements are typically selected based on a detailed clinical assessment that may include symptoms, medical history, medications, dietary intake, pathology testing, body composition analysis, and overall health goals. The aim is not simply to “take a vitamin,” but to target specific physiological processes and nutritional deficiencies in a more precise and evidence-based way.

Practitioner-only products also tend to use higher-quality ingredients, more bioavailable nutrient forms, and therapeutic dosing that may not be available in standard retail products. In many cases, these supplements are designed to address more complex clinical presentations such as hormonal changes, gut dysfunction, nutrient deficiencies, metabolic health concerns, chronic inflammation, or fatigue.

Another important consideration is that more supplements do not necessarily mean better health. Taking unnecessary supplements, incorrect doses, or poorly formulated products can sometimes create unintended problems or simply result in expensive urine. This is why professional guidance matters.

Good nutrition should always form the foundation of health, with supplements used strategically and purposefully where appropriate. The goal should never be to take more products than necessary, but rather to identify what the body genuinely needs and use targeted interventions to support better outcomes.

At Defining Health, I take an evidence-based and personalised approach to nutrition and supplementation, helping clients navigate the often-confusing world of vitamins, minerals, and practitioner-only products with clarity and confidence.

Renee Bailey is a Brisbane-based Certified Practising Nutritionist specialising in women's health, perimenopause and menopause. She helps women manage weight gain, low energy, gut health concerns, hormonal changes, bone health and healthy ageing through evidence-based nutrition and lifestyle medicine. Renee is currently completing a Master of Sexology and has a special interest in women's health and sexual wellbeing.

Renee works with all medical and health professionals for a multidisciplinary, multi-system approach to healthcare.