The Zingarelli gives the sense of "effetto plastico" as "che crea o suggerisce l'idea del rilievo, del movimento armonico". The Corriere della Sera entry below may be of use as well.

For a translation that would be more along the lines of the typical English marketing jargon someone from that area would need to speak up; I don't think that way. :) That said, a search for 'royal jelly harmonizing' turns up quite a number of examples, so this would seem to fit.

Another possibility:

Royal Jelly Benefits
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1 Apr 2006 ... The rejuvenating effect of Royal Jelly also translates in a powerful anti aging supplement. It helps accelerate tissue regeneration and ...
www.articleclick.com/Article/Royal-Jelly.../940777 - Copia cache - Simili

The Ultimate Skincare System from Yvonne Gray Cosmetics International
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Living proof of such profound rejuvenating effect may be attributed to a mysterious 4% of the content of Royal Jelly which is as yet, ...
www.yvonne-gray.co.uk/YG_original/content/jellyset.htm - Simili

From the hive
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Traditionally, people in many Asian countries have taken royal jelly for its reputed rejuvenating effect. How it works: Recent research on animals confirms ...
deliciouslivingmag.com/health/.../dl_article_2048/

Japan Fresh Royal Jelly 750mg 220's - Welcome To Vgowell
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Royal jelly contains a unique blend of bio active amino acids and 5000 enzymes has been known throughout the ages to produce a rejuvenating effect on the ...
www.vgowell.com/prod1.asp?id1=223