https://www.theparadoxinstitute.com/read/the-ugly-truth-of-male-breastfeeding
This has a quick and very brief run down on that 2023 study that I cannot access.
Study One
The first study cited in this section involves measuring the nutrients from a 47 year old transwoman who wished to support breastfeeding of their child in addition to the mother's breastfeeding. Similar to the previous cases, this transwoman was only able to produce approximately 150 mL or about 5 oz per day. The expressed milk was analyzed for four nutrients: protein, lactose, fat, and calories. These values were then compared to average values of breastfeeding women between 2 and 3 months after birth.
The results of the analysis were that the milk produced was within a reasonable range of the standard numbers with the exception of one: fat. The average fat for breastfeeding women was 3.4 g/dL. The amounts collected from the transwoman's samples ranged from 4.1-6.2 g/dL. The amount of fat in milk that the infant receives is important for the growth and development of the infant, however too much fat can also result in health problems early in life including obesity and diabetes.
It should be noted that the mother in this case also breast-fed the infant in question, so despite the poor volume, the infant was never malnourished.
In addition, the study states its own limitations that the nutrient measurements may be over or under represented as the collection was over an estimated 24 hour period.
Perhaps the most concerning part of the study is that it included a statement from the transwoman about how affirming the act of breastfeeding was and the emotional and bonding benefits for the transwoman. While bonding to the infant is important, such bonds can be achieved through skin to skin contact and does not require breastfeeding.
So, have they analysed it for all the other compounds? Or is this a repeat of just the nutrition values, yet again. It seems that this was in line with what the person interviewed on the BBC said last night. That person stated that the substance was 'richer' than breast milk produced by the mother, or was 'more nutritious' used? I can't remember. The gist was that that person discussed 'nutrition' and not any other compounds.
And this is the second or third study into the 'nutrition value' of male lactation substances.... yet if there is still not study of other compounds, that seems to be completely unbalanced in the story they are trying to spin here.