Yes, you certainly can. Taking 2 capsules of 1000 mcg biotin per day would amount to a total intake of 2000 mcg of biotin, which is less than the 5000 mcg you were taking previously. It's always a good idea to gradually reduce the dosage and monitor how your body responds. As always, if you're on medication or have medical conditions, it's advisable to consult with a healthcare provider before making changes to your supplement regimen.

The dosage for children can vary, depending on their specific nutritional needs. For an 11-year-old child, a lower dosage than 1000 µg might be recommended. For instance, we have the Solgar Biotin 300 µg in our range, which could be suitable.

Yes, you can combine these two.

Yes, these two products can be combined very well.

The minimum amount needed for good health is established at 40 mcg per day. However, there is no maximum dose for this vitamin. Therefore, one can safely take 1000 or even 5000 mcg per day. What the body does not need is effortlessly excreted. This is, at most, a waste of money.

The article you refer to only mentions the temporary influence on certain blood measurements. Therefore, it is recommended to pause the use of such supplements 24 hours before these measurements.

It cannot be stated that 40 mcg is necessarily sufficient for every individual. The Recommended Daily Allowance is a general guideline that is not necessarily relevant for every person and every situation. It is quite possible that someone benefits from a (temporary) intake of, for example, 50 or even 50,000 mcg per day.

Many studies have been conducted with higher dosages, and it is therefore understandable that some people wish to take a similar dose. In that regard, 1000 mcg can be seen as a high but not exceptionally high dosage. An exceptionally high dosage can only be considered from about 10,000 mcg per day.