Riham,
The GFCF diet should be ‘all or nothing’ in the beginning for at least 3 months (minimum). This is the only way to see its true effectiveness. Otherwise, just reducing the consumption in the beginning won’t give a clear picture. Its like telling someone who has a drinking problem to just cut back on their drinking versus going off of alcohol completely. Typically, within 4 to 6 weeks its pretty clear whether the diet is having obvious effects. Therefore, get a clear picture first than decide if modifying makes sense overtime. Some kids do okay with reduced intake, but I would only make this determination after a complete elimination trial in the beginning.
I don’t feel any topical supplement works as well as oral. However, this is not to imply that topicals don’t work at all, but usually not a good. Topical glutathione is okay and better than nothing. My favorite form of glutathione is the lipoceutical (liposomal) glutathione from New Beginnings Nutritionals.
I don’t have a lot of experience with transdermal vitamins, but I cannot imagine them working great.
I hope this helps.
Dr. Woeller