It is difficult to give an exact absorption percentage without clinical data for the specific product, but the general rule is that magnesium bisglycinate has significantly better bioavailability than inorganic forms such as magnesium oxide, of which only about 4% of the ingested amount is absorbed (internal Magnesium Deep Dive, PMC12847085, 2025). It is also important to distinguish between the mass of the whole compound (magnesium bisglycinate) and the actual elemental magnesium content, which is around 14% of the compound's mass – this information should be evident from the nutrition panel on the label. If it is not clearly stated, we recommend checking the elemental magnesium content directly with the seller.

Some literature reviews link lower magnesium intake with worse mood and suggest a possible role for magnesium as a supporting factor in mental well-being, but the evidence base for a direct effect on clinical depression remains limited and not strong enough for firm conclusions (Botturi et al., 2018). Magnesium can therefore be understood as one of the factors of general well-being, but by no means as a substitute for professional mental health care. If you notice persistent low mood or symptoms of depression, please consult a doctor or an appropriate mental health professional.

Magnesium needs increase slightly during pregnancy (the recommended intake is roughly 350-360 mg/day, depending on age), but the decision to start any dietary supplement during pregnancy or breastfeeding should always be made by a doctor or gynecologist who is familiar with your full health picture, any medications, and other supplements you are already taking (NIH Office of Dietary Supplements, 2024). As a dietary supplement seller, we cannot provide individual medical advice, so we direct you to consult a professional before starting to use the product.

In a randomized, placebo-controlled study, a statistically significant difference in improvement of insomnia symptoms (ISI scale) compared to placebo was observed after four weeks of regular daily use of about 250 mg of elemental magnesium as bisglycinate (Schuster et al., 2025). This means the effect should not be expected overnight, but rather with consistent, multi-week use, with the measured effect size being small (Cohen's d = 0.2), so it makes sense to have realistic expectations and to treat magnesium as one of the supporting habits alongside otherwise good sleep hygiene.