AI went through your link and had this to say. I don’t have the expertise myself.
Is there anything negative in this? A negative perspective can only be found in certain scenarios, and they mostly arise in discussions (e.g., on the Inderes forum or other places):
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Risk of hemoglobin or iron overload (e.g., hemochromatosis, hereditary iron storage disease): For healthy men (and postmenopausal women), iron requirements are low (as noted in the report: 6 mg EAR / 8 mg RDA), so if Solein is used in large quantities (e.g., 20–30 g of protein per serving → ~25–40 g of Solein is needed, resulting in 27–44 mg of iron), it can exceed the daily upper limit (UL 40–45 mg/day for adults) in just one serving. This is a risk for the few who have a genetic predisposition to accumulate too much iron – but it applies to a very small part of the population (not a common problem in Finland).
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Absorption: Not all iron in Solein is as well-absorbed as heme iron from meat (estimated heme iron share ~5% in some discussions), but it is still non-heme iron, which is enhanced by Vitamin C etc. Still, a large dose can lead to high intake.
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In practice: If Solein is used moderately (e.g., 10–20 g/day in products), the iron intake remains at 11–22 mg, which is perfectly safe for most and even beneficial for many (especially women, vegetarians, athletes).
In summary: The previous answer emphasized the low iron requirement in men (6–8 mg/day for balance), but Solein’s high iron content is not “negative” in general – it is a strength for most users and a marketing asset. It can only be negative for those who already have high iron stores (high ferritin) or a hereditary sensitivity to iron overload. For most Finns (where iron deficiency occurs more frequently than overload), it is a plus.