GPs raise concerns over low-dose iron supplements ‘barely more than cornflakes
16 Jan 2026
For Dr Danny Byrne, a GP and long-standing partner at Chandlers Hill Surgery in Adelaide, ineffective iron supplements are just “another example of products that aren’t in our patients’ best interests.” Pharmacist Joy Gailer, who also works at the clinic, said the recent attention is unsurprising.
Ms Gailer has extensive experience in iron deficiency management, including visiting general practices for education and helping SA Health develop guidelines for administering intravenous iron in primary care.
“Many of these products contain very little iron – sometimes as low as five milligrams – which is barely more than a bowl of cornflakes,” she said. “With so many options on the market, it’s confusing for consumers and can give them false hope.”
Dr Byrne agrees, noting that many low-dose supplements do little to correct iron deficiency. “They’re marketed as safe with no side effects, but that’s because the iron content is negligible. People take them and see no results,” he said.
While many of these products carry an AUST-L number from the Therapeutic Goods Administration (TGA), they haven’t been formally evaluated for effectiveness. The TGA has acknowledged that requiring efficacy assessments for all low-risk products could increase costs and delay the release of new products.
For Dr Byrne, this creates challenges in treating iron deficiency, a common reason patients visit their GP. He stresses the importance of correct dosing when prescribing oral iron, which remains the first-line treatment.
“It’s important for GPs to explain the proper dose, usually 100–200 milligrams, and provide clear instructions,” he said. “Even for over-the-counter treatments, patients need guidance to get results.”
Ms Gailer warns that patients self-diagnosing and treating their own symptoms with low-dose iron can be risky. “If people keep taking supplements that don’t work, their deficiency may continue, which can become dangerous,” she said.
She also noted that some products focus on being gentle on the stomach rather than being effective, which can mislead patients. “Many people already think they won’t tolerate oral iron, but when taken correctly, it’s very effective,” she said.
Both Dr Byrne and Ms Gailer emphasise having open conversations about side effects like reflux or constipation. “If patients know what to expect, they’re more likely to manage any discomfort and continue treatment successfully,” Dr Byrne said.
With recent concerns around vitamin B6 supplements and their links to neuropathy, GPs are also encouraged to monitor all supplements their patients are taking. “We can’t just take patients at their word,” Dr Byrne said. “Sometimes it’s only after looking closer that we understand why treatments aren’t working, such as when an iron tablet only contains five milligrams. It’s a continuous process.”
https://www1.racgp.org.au/
Source: newsGP – GPs probe supplements with ‘little more iron than a bowl of cornflakes’