According to the ingredient declaration, the product contains magnesium bisglycinate, magnesium oxide, and magnesium lactate. Bisglycinate is an organic, chelated form with high bioavailability and an additional calming effect via its glycine component (AdvancedU Magnesium Deep Dive, PMC12847085, 2025), lactate is relatively well soluble and quickly available, while oxide is added primarily due to its high elemental magnesium content per gram, which helps achieve a high total mg value in a smaller capsule, even though it has the poorest absorption of all the forms, estimated at around 4% (Blancquaert et al., 2019). The combination therefore brings together speed, good tolerability, and lower cost in a single product, at the cost of part of the dose coming from a less well-absorbed form.

Magnesium is a cofactor for more than 300 enzymatic reactions, including energy metabolism (ATP production), so a magnesium deficiency can contribute to feelings of tiredness. If your dietary magnesium intake is borderline or insufficient, an additional approximately 350 mg of elemental magnesium daily from this product may help improve feelings of energy (Rondanelli et al., 2023). However, it's important to know that a recent randomized study did not confirm improved physical performance from short-term supplementation in people who were not actually deficient in magnesium (Heubi et al., 2025) – so the effect is most pronounced in those who genuinely had lower intake beforehand, not equally in everyone.

Magnesium can affect the absorption of certain medications, including some antibiotics (a spacing of at least 2 hours is recommended) and bisphosphonates, while long-term use of certain proton pump inhibitors can itself lower the body's magnesium levels (NIH Office of Dietary Supplements, 2023). The product label explicitly advises that people taking medication consult a doctor before use – this also applies to blood pressure and thyroid medications, since interactions may occur or spacing between doses may be needed. AdvancedU does not provide this kind of medical advice – for a definitive assessment of the safety of this combination, please consult your doctor or pharmacist.

We understand this can be confusing – the actual ingredient declaration for this product clearly lists magnesium oxide as one of the three forms of magnesium used, so this description relies on that declaration as the authoritative source. Any conflicting promotional claims about the absence of oxide are not consistent with the stated ingredient list. If it's important to you that the product doesn't contain oxide, we recommend checking the latest official label directly with the OnEnergy brand before purchasing, as the composition may change between batches.